
Dimension 20 is an Actual Play tabletop adventure show on the comedy streaming site Dropout, hosted by Brennan Lee Mulligan and a main cast of former CollegeHumor alumni, Emily Axford, Ally Beardsley, Brian Murphy, Zac Oyama, Siobhan Thompson, and Lou Wilson, known as The Intrepid Heroes. Besides starring mostly people with comedy and improv backgrounds, Dimension 20 also decidedly focuses on shorter adventures than most tabletop actual-plays, their seasons always keeping it around 20 episodes. The show is also markedly different from other actual-play shows in that it is an expansive Anthology Series, with each new campaign following a new cast of characters in a new world (though returning to previous campaigns for sequel seasons is not uncommon) rather than a single overarching story.
In addition to the main adventures, Dimension 20 also produces shorter seasons called Side Quests, featuring a rotating cast made up of comedians, actors and other prominent tabletop adventure players (Including Matthew Mercer, Aabria Iyengar, Erika Ishii, and B. David Walters among others), sometimes GM'd by Brennan, sometimes by a guest GM.note
The first season, Fantasy High, quickly proved to be a fan favorite. Before it even finished airing, two follow-ups were greenlit: another season with the original cast in a new setting, and a 6-episode "side quest" with a whole new cast. It also became the first season to get an adaptation in the form of an official webcomic. After five years and twenty-one seasons, Dimension 20 has established itself as one of the flagship shows on Dropout and the only one to air on a weekly schedule (All other Dropout shows are released every two weeks.). When Dropout launched Dropout 24/7, a livestream of Dropout content, a marathon of Dimension 20 was the first thing to air.
Dimension 20 is usually considered alongside Critical Role and The Adventure Zone as some of the best-known Actual Play TTRPG shows on the internet.
Seasons and casts
Follows a group of misfit students at Aguefort Adventuring Academy, a high school for heroes in a strangely suburban area of a traditional high fantasy realm typical of Dungeons & Dragons. Thrust together under the most Breakfast Club of circumstances, they very quickly get embroiled in a mystery that it seems like adults should probably be handling. And things just spiral from there. 17 episodes, plus 2 bonus episodes.
- Brennan Lee Mulligan as the Dungeon Master
- Siobhan Thompson as Adaine Abernant, high elf wizard
- Lou Wilson as Fabian Seacaster, half-elf fighter
- Ally Beardsley as Kristen Applebees, human cleric
- Zac Oyama as Gorgug Thistlespring, half-orc barbarian
- Emily Axford as Fig Faeth, wood elf / tiefling bard
- Brian Murphy as Riz Gukgak, goblin rogue
- Brennan Lee Mulligan as the Dungeon Master
- Amy Vorphal as Efink Murderdeath, high elf cleric and Far-Seer of the Lands of Midnight
- Mike Trapp as Sokhbarr, Kashai ranger and Master of Beasts
- Erika Ishii as Lillith, drider druid and Mother of Spiders
- Matthew Mercer as Kraz-Thun, Pactwraith warlock and King of the Vinguri
- Ify Nwadiwe as Markus St. Vincent, human rogue and Captain of the Forgotten Fleet
- Rekha Shankar as Maggie, tiefling barbarian and Daughter of Darkness
- Brennan Lee Mulligan as the Dungeon Master
- Siobhan Thompson as Misty Moore, fairy bard
- Lou Wilson as Kingston Brown, human cleric
- Ally Beardsley as Pete the Plug, human sorcerer
- Zac Oyama as Ricky Matsui, human paladin
- Emily Axford as Sofia Bicicleta, human monk
- Brian Murphy as Kugrash, rat druid
- Brennan Lee Mulligan as the Dungeon Master
- Siobhan Thompson as Adaine Abernant, high elf wizard
- Lou Wilson as Fabian Seacaster, half-elf fighter
- Ally Beardsley as Kristen Applebees, human cleric
- Zac Oyama as Gorgug Thistlespring, half-orc barbarian
- Emily Axford as Fig Faeth, wood elf / tiefling bard
- Brian Murphy as Riz Gukgak, goblin rogue
- Brennan Lee Mulligan as the Dungeon Master
- Griffin McElroy as Bean, Moocher monk
- Travis McElroy as Car-go Jones, Car-Mo-Bot rogue
- Justin McElroy as Rick Diggins, Click-O rogue
- Clint McElroy as Boomer Coleptra, beetle fighter
- Jessica Ross as Agnes, fairy bard
- Lily Du as TI-83, tik-tek artificer
- Brennan Lee Mulligan as the Dungeon Master
- Siobhan Thompson as Princess Ruby Rocks, red licorice rogue
- Lou Wilson as King Amethar of House Rocks, rock candy barbarian
- Ally Beardsley as Liam Whilhemina of House Jawbreaker, peppermint ranger
- Zac Oyama as Chancellor Lapin Cadbury, chocolate bunny warlock
- Emily Axford as Princess Jet Rocks, black licorice rogue
- Brian Murphy as Sir Theobold Gumbar, gummy bear fighter
- Brennan Lee Mulligan as the Dungeon Master
- Carlos Luna as Cheese, forest gnome wizard
- Krystina Arielle as Barbarella Sasparilla Gainglynn, aasimar bard / cleric
- Aabria Iyengar as Myrtle, merfolk cleric
- B. David Walters as Marcid, bugbear ranger
- Marisha Ray as Sunny, aarakocra paladin
- Matthew Mercer as Jack, ratfolk barbarian
- Brennan Lee Mulligan as the Dungeon Master
- Siobhan Thompson as Iga Lisowski, human warlock
- Lou Wilson as Kingston Brown, human cleric
- Ally Beardsley as Pete Conlan, human sorcerer
- Zac Oyama as Ricky Matsui, human paladin
- Emily Axford as Sofia Lee, human monk
- Brian Murphy as Cody "Night Angel" Walsh, human paladin
- Brennan Lee Mulligan as the Dungeon Master
- Ally Beardsley as Lars Vandenchomp, canine fighter
- Sam Reich as Buckster $ Boyd, javelina rogue
- Katie Marovitch as Gangie Green, weasel rogue
- Raphael Chestang as Vicar Ian Prescott, owl bard
- Rekha Shankar as Daisy D'umpstaire, raccoon rogue
- Grant O'Brien as Detective Sylvester Cross, fox rogue
- Aabria Iyengar as the Dungeon Master
- Erika Ishii as Karen Keiko Tanaka aka Dream (later goes by K)
- Danielle Radford as Sam Black
- Lou Wilson as Whitney “Sandwich Man” Jammer
- Brennan Lee Mulligan as Evan Kelmp
- Brennan Lee Mulligan as the Dungeon Master and as Zelda Donovan, satyr barbarian
- Aabria Iyengar as Antiope Jones, human ranger / fighter
- Erika Ishii as Danielle 'Yelle' Barstock, half-elf druid
- Rehka Shankar as Katja Cleaver, half-orc fighter
- Persephone Valentine as Sam Nightingale, water genasi sorcerer / bard
- Isabella Roland as Ostentatia Wallace, dwarf cleric
- Becca Scott as Penny Luckstone, halfling rogue
Welcome ghosts, ghouls, and non-boo-nary pals to Bram University, an institution of higher learning for mortals and monsters alike. We'll be following four college students who are looking for love in all the wrong places. Four episodes.
- Gabe Hicks as the Storyteller.
- Ify Nwadiwe as Terry Talbo, business major and werewolf.
- Ally Beardsley as Megan Mirror, psychology major and ghost.
- Danielle Fernandez as Seven, accounting major and vampire.
- Lily Du as Tuti IV, structural engineering major and mummy.
Set in the universe of Starstruck, a graphic novel series by Elaine Lee, this season is a space opera that follows the crew of the spaceship "The Red Hot" as they try to make a living in a tough, lawless galaxy. Uses the SW5e (Star Wars Fifth Edition) RPG system instead of regular 5e. 18 episodes.
- Brennan Lee Mulligan as the Game Master
- Emily Axford as Sundry Sidney, android sentinel
- Brian Murphy as Big Barry Syx, cloned human berserker
- Siobhan Thompson as Riva, Aguatunisian consular
- Lou Wilson as Gunthrie "Gunnie" Miggles-Rashbax, human cyborg engineer
- Ally Beardsley as Margaret Encino, human scholar
- Zac Oyama as Captain Norman "The Skipper" Takamori, human operative
Taking place in late 19th century Transylvania, followers of Count Dracula eagerly await his return from a long journey away… only to find them and their dark lord besieged by enemies and danger from all angles. With Dracula gravely injured, four of his followers – his vampiric bride, a mad scientist, his first sired vampire, and a vampire-to-be – make a desperate, mad dash to get his coffin back to Castle Dracula before all is lost. 6 episodes.
- Jasmine Bhullar as the Dungeon Master
- Zac Oyama as Squing, first blood child of Dracula
- Erika Ishii as May Wong, aspiring actress and bride of Dracula
- Isabella Roland as Dr. Aleksandr Astrovsky, mad scientist
- Carlos Luna as Wetzel, a mortal who wants to be a vampire very badly
- Aabria Iyengar as the Dungeon Master
- Emily Axford as Lady Chirp Featherfowl, Countess of Cluckingham
- Surena Marie as Gwyndolin Thistlehop
- Brennan Lee Mulligan as Captain K.P. Hob
- Oscar Montoya as Delloso de la Rue, Mistrex of the Bloom
- Omar Najam as Andhera, Prince of Air and Darkness
- Lou Wilson as Lord Squak Airavis, Earl of Peckersburg
- Brennan Lee Mulligan as the Dungeon Master
- Emily Axford as Ylfa Snorgelsson, lycanthrope barbarian
- Ally Beardsley as Mother Timothy Goose, human bard
- Brian Murphy as Prince Gerard of Greenleigh, human/frog fighter
- Zac Oyama as Puss in Boots, cat rogue
- Siobhan Thompson as Princess Rosamund du Prix, human ranger
- Lou Wilson as Pinocchio, puppet warlock
Taking place 20 years before the events of A Crown of Candy, we come to a very different version of the continent of Calorum, where a new band of adventurers must navigate the machinations of their nations in the midst of the upheaval of the Ravening War. 6 episodes.
- Matt Mercer as the Dungeon Master
- Anjali Bhimani as Queen Amangeaux Epicée du Peche, mango rogue
- Aabria Iyengar as Karna Solara, chili pepper bard / warlock
- Brennan Lee Mulligan as Bishop Raphaniel Charlock, radish rogue / bard
- Zac Oyama as Colin Provolone, provolone cheese fighter / rogue
- Lou Wilson as Thane Delissandro Katzon, pastrami on rye fighter
Set in the high fantasy realm of Kelvorda, four diverse "Questing Queens" are tasked with journeying to the Underworld to solve their respective problems. 4 episodes.
- Brennan Lee Mulligan as the Dungeon Master
- Monét X Change as Troyánn, half-merfolk and half-elf assassin
- Alaska Thunderfuck as Princess, orc barbarian
- Bob The Drag Queen as Gertrude, tiefing witch
- Jujubee as Twyla, fairy
A Film Noir story taking place in the mind of one Elias Hodge, using a modified version of the Kids on Bikes system by Hunters Entertainment. 6 episodes.
- Brennan Lee Mulligan as the Dungeon Master
- Mike Trapp as Detective Hunch Curio
- Siobhan Thompson as Imelda Pulse
- Danielle Radford as Anastasia Tension
- Freddie Wong as Dan Fucks
- Alex Song-Xia as Conrad Schintz
- Hank Green as The Fix
- Aabria Iyengar as the Dungeon Master
- Jasper William Cartwright as Thorn Vale, stoat ranger
- Erika Ishii as Ava, stoat barbarian/fighter
- Brennan Lee Mulligan as Tula, stoat paladin
- Isabella Roland as Lila, stoat rogue
- Rashawn Nadine Scott as Viola, stoat paladin
- Siobhan Thompson as Jaysohn, stoat monk
- Brennan Lee Mulligan as the Dungeon Master
- Siobhan Thompson as Adaine Abernant, high elf wizard
- Lou Wilson as Fabian Seacaster, half-elf fighter bard
- Ally Beardsley as Kristen Applebees, human cleric
- Zac Oyama as Gorgug Thistlespring, half-orc barbarian artificer
- Emily Axford as Fig Faeth, wood elf / tiefling bard warlock paladin
- Brian Murphy as Riz Gukgak, goblin rogue
Six down-on-their-luck strip-mall employees are sucked into a magic VHS tape, and into the world of an 80s action movie, complete with explosions, badass one liners, and motorcycles with katanas attached to them. Transformed into high-octane action heroes, they must figure out how to navigate the movie to get home. Uses the Never Stop Blowing Up system (a heavily modified version of the Kids on Bikes system, by Hunters Entertainment and Dropout). 10 episodes.
- Brennan Lee Mulligan as the Game Master
- Ally Beardsley as Russell Feeld / Jennifer Drips
- Ify Nwadiwe as Wendell Morris / Vic Ethanol
- Isabella Roland as Paula Donvalson (neé Buocadifuoco) / Jack Manhattan
- Rekha Shankar as Usha Rao / G13
- Alex Song-Xia as Liv Skyler / Kingskin
- Jacob Wysocki as Andy 'Dang' Litefoot / Greg Stocks
- Aabria Iyengar as the Game Master
- Erika Ishii as K (formerly known as Dream)
- Danielle Radford as Sam Black
- Lou Wilson as Whitney “Sandwich Man” Jammer
- Brennan Lee Mulligan as Evan Kelmp
A multiversal crossover between the settings of Fantasy High, The Unsleeping City, A Crown of Candy, A Starstruck Odyssey, and Neverafter, where all the players are randomly assigned one of their past characters and are dropped into one of the aforementioned settings. Toured across the UK and Ireland in April 2024 and released online in December 2024.
- Brennan Lee Mulligan as the Dungeon Master
- Siobhan Thompson as Rowan Berry, Adaine Abernant, Rosamund du Prix, and Princess Ruby Rocks
- Ally Beardsley as Liam Wilhelmina, Margaret Encino, Pete Conlan, Sir Amanda Maillard, and Kristen Applebees.
- Zac Oyama as Ricky Matsui, Gorgug Thistlespring, Skip, and Chancelor Lapin Cadbury.
- Emily Axford as Ylfa Snorgelsson, Sofia Lee, Sundry Sidney, and Fig Faeth,
- Brian Murphy as Big Barry Syx, Kugrash, Cody Walsh, Gerard of Greenleigh, and Riz Gukgak.
- Lou Wilson as Fabian Seacaster and Pinnochio note
Returning to the high fantasy realm of Kelvorda, the "Questing Queens" traverse the world in search of treasure pursued by friend and foe alike. 6 episodes.
- Brennan Lee Mulligan as the Dungeon Master
- Monét X Change as Troyánn, half-merfolk and half-elf assassin
- Alaska Thunderfuck as Princess, orc barbarian
- Bob The Drag Queen as Gertrude, tiefing witch
- Jujubee as Twyla, fairy
- Brennan Lee Mulligan as the Dungeon Master
- Xavier Woods as Julius Mortem, a human monk
- Bayley as Thea Kitterloo, a minotaur/kangaroo barbarian
- Kofi Kingston as Adonis Thanaformus, a human (undead) fighter
- Chelsea Green as Tabatha, a tabaxi rogue
In the Steampunk Adventure-Friendly World of Gath, the crew of the Zephyr seeks out the lost continent of Zood. 20 episodes.
- Brennan Lee Mulligan as the Dungeon Master
- Ally Beardsley as Olethra MacLeod, human rogue
- Brian Murphy as Maxwell Gotch, human pugilist
- Emily Axford as Marya Junková, human artificer
- Lou Wilson as Montgomery LaMontgommery, human ranger
- Siobhan Thompson as Vanellope "Van" Chapman, human fighter
- Zac Oyama as Daisuke Bucklesby, human fighter
- Brennan Lee Mulligan as the Game Master
- Ally Beardsley as Quinn Wedbush
- Kimia Behpoornia as Tess Tube5
- Vic Michaelis as Hugi
- Oscar Montoya as Poppy Persona
- Zac Oyama as Connor Kawasaki
- Jacob Wysoki as Kokomo
- Brennan Lee Mulligan as the Storyteller
- Emily Axford as Vesper Childers
- Ally Beardsley as HJ Wingstreet
- Brian Murphy as Mitch Frederick
- Zac Oyama as Zaeth Bondana
- Siobhan Thompson as La Contesse Madeleine d'Artois
- Lou Wilson as LaVonte Worthy
- Katie Marovitch as the Dragon Master
- Aabria Iyengar as Blue M&M
- Brennan Lee Mulligan as Hat
- Matthew Mercer as Mark Mercer as Lint
- Jasmine Bhullar as Army Man
Dimension 20 seasons:
- Fantasy High
- Escape From the Bloodkeep
- The Unsleeping City
- Tiny Heist
- A Crown of Candy
- Pirates of Leviathan
- Mice & Murder
- Misfits and Magic
- The Seven
- Shriek Week
- A Starstruck Odyssey
- Coffin Run
- A Court of Fey & Flowers
- Neverafter
- The Ravening War
- Dungeons and Drag Queens
- Mentopolis
- Burrow's End
- Never Stop Blowing Up
- Titan Takedown
- Cloudward, Ho!
- Gladlands
- City Council of Darkness
- On A Bus
Dimension 20 LIVE:
The Dimension 20 LIVE label was previously used for Fantasy High: Sophomore Year which was live streamed from the Dome. In 2024 it was rebranded to its current use for arena tours and specials.- Time Quangle (Intrepid Heroes crossover) across UK and Ireland (Filmed April 17-24, 2024, released to Dropout between September 12, 2024 and December 26, 2024)
- Gauntlet at the Garden (The Unsleeping City) at Madison Square Garden in New York, New York (Filmed January 24, 2025, released to Dropout May 13, 2025)
- Battle at the Bowl: Rumble in the Chungle (Fantasy High) at The Hollywood Bowl in Los Angeles, California (Filmed June 1, 2025, released to Dropout November 12, 2025)
- Quangle Quest (Intrepid Heroes crossover) at Climate Pledge Arena in Seattle, Washington (Filmed July 20, 2025, released to Dropout December 10, 2025)
- Viva Más Vegas (A Starstruck Odyssey) at the MGM Grand Garden Arena in Las Vegas, Nevada (Filmed November 2, 2025, released to Dropout March 11, 2026)
- Born Lucky: Since actual dice are rolled when game mechanics require it, some players have obviously better luck than others. No one on the cast is as famous for this as Ally Beardsley, who consistently manages to roll natural 20s at times when it's narratively appropriate. Their consistent high rolls at plot-important moments started in Fantasy High Freshman Year when they asked to come back to life and continue the fight with Kalvaxus on a natural 20, and they've had a similar moment in almost every other Intrepid Heroes season. On at least one occasion, this has forced Brennan to rewrite portions of the active campaign to account for it. They even managed to do it live during a Time Quangle show. Acknowledged in the game mechanics explanation for City Council of Darkness, where the note for a difficulty of 7+ is "hope you're Ally Beardsley."Brennan: (on an incident in The Unsleeping City Chapter II) Ally, I'm gonna be real with you. If you had rolled a 19, you'd be fuckin' dead.
- Born Unlucky: ...On the flip side, actual dice rolls mean that some players can be statistically unlucky with their rolls.
- Brian "Murph" Murphy is so unlucky that his bad luck has been exploited by the Intrepid Heroes when they want low rolls. On multiple occasions he's rolled for the table, rolled low, and had to hastily defend himself. He's so unlucky that when his first few rolls in Cloudward, Ho! were all over 18 on the die, the other players start joking that this isn't Murph.Murph: (in indignant rage) Statistically, I have just as good a chance of rolling good as any of you!
- Lou Wilson is similarly unlucky when it comes to rolls, most notably in Fantasy High Sophomore Year when a streak of bad rolls, including nine natural 1s over the course of two episodes, singlehandedly shifted Fabian's character development and forced Siobhan to confiscate and "cleanse" Lou's dice. Even after this cleansing, Lou's dice tend to roll low when trying to make Fabian do cool things for no apparent reason.
- Matthew Mercer rolled horribly in Escape from the Bloodkeep, getting stuck fighting a halfling for an entire episode and losing. Ironically, when he played a character who was an in-universe example of this trope in Pirates of Leviathan, he rolled much closer to average.
- Brian "Murph" Murphy is so unlucky that his bad luck has been exploited by the Intrepid Heroes when they want low rolls. On multiple occasions he's rolled for the table, rolled low, and had to hastily defend himself. He's so unlucky that when his first few rolls in Cloudward, Ho! were all over 18 on the die, the other players start joking that this isn't Murph.
- Early-Installment Weirdness:
- Fantasy High was the first time multiple players ever played Dungeons and Dragons and the first time Brennan ran 5th Edition, so certain encounters are more deadly than they should be and some player characters are built in ways they wouldn't be later (like Kristen Applebees having a Dexterity score of four because Ally didn't realize how many things depended on it) because the players just didn't know what they were doing yet. By the time The Unsleeping City and A Crown of Candy roll around, the Intrepid Heroes have gotten much better at tactically playing the game and are much closer to "optimal" D&D play, while Brennan has learned to balance 5th Edition combat better.
- The introductory "Say hi, Intrepid Heroes!" "Hi, Intrepid Heroes!" gag didn't start until around episode 8 of Fantasy High and wasn't used in a modified form ("Say hi, Vile Villains!") for sidequests until a few episodes into Escape from the Bloodkeep.
- Early seasons started each episode with a Previously on… segment clipped together from the last episode. This was dropped for Sophomore Year due to the livestreamed nature of the season making it impossible, restored for Tiny Heist, and then dropped again in A Crown of Candy and future seasons. Brennan still presents a verbal recap for the players at the beginning of each episode.
- Early seasons of the show, especially the "Intrepid Heroes" seasons, would always alternate between an RP/exploration episode and a combat episode, where each RP/exploration episode would end with Brennan telling the players to roll initiative, and the combat taking up the entirety of the next episode. Later seasons would become more fluid in this approach, with several RP/exploration episodes in a row, or with combat encounters starting in the mid-episode and spilling over into the next, and sometimes ending mid-episode as well.
- The Quiet One: Zac Oyama typically fills this role in series where he's a player, being more laconic than other members of the cast, though he manages to play it off in-character every time— Gorgug is socially awkward and still figuring out who he is in Fantasy High, Skip is learning how his body functions in A Starstruck Odyssey, and Ricky Matsui from The Unsleeping City just being kind of a himbo. His laconic nature often leaves the DM he's playing with in stitches when he does something unexpected, such as Ricky swimming across the Hudson to put out Sofia's burning house or Gorgug tricking Brennan into letting him go into Mindless Rage, thus allowing him to be freed of mind control.
- Running Gag: Some bits have carried over between campaigns, as is to be expected with a cast of similar but rotating players.
- "It's 3AM in a warehouse" came about when A Crown of Candy had
real fire code issues in the dome that forced production to film large portions of the campaign at early hours in a warehouse. The Intrepid Heroes use it now to remark on when Brennan starts going off the rails. - "Honor the cock" was a Murph-ism in Junior Year that was immediately picked up as a catchphrase for when a die comes up cocked and needs to be rerolled.
- "It's 3AM in a warehouse" came about when A Crown of Candy had
