Short answers, pulled from the story.
Dimension 20 debuted on the 26th of September 2018 with Brennan Lee Mulligan serving as Dungeon Master. The show emerged in 2018 as a flagship production for Dropout, the streaming service launched by CollegeHumor.
Emily Axford, Ally Beardsley, Brian Murphy, Zac Oyama, Siobhan Thompson, and Lou Wilson form the core Intrepid Heroes cast. Brennan Lee Mulligan serves as Dungeon Master for all main campaigns while occasionally stepping aside for guest Game Masters like Aabria Iyengar.
Most Dimension 20 campaigns utilize Dungeons & Dragons 5th edition rules though Brennan Lee Mulligan creates house rules altering the system for specific seasons. Several campaigns employ entirely different role-playing game systems such as Kids on Bikes or Star Wars 5e including homebrewed frameworks like Never Stop Blowing Up released free in November 2024.
The show has produced twenty-seven distinct campaigns spanning from 2018 through early 2026 with varying lengths and themes. These include Fantasy High which premiered the 26th of September 2018 set in Elmville and The Unsleeping City which debuted the 9th of July 2019 featuring New Yorkers protecting residents from underlying magic.
A series of six live non-canonical Time Quangle events occurred in Ireland and the United Kingdom during April 2024 where performers rolled dice to determine characters pulling randomly from five past campaigns. Gauntlet at the Garden occurred the 24th of January 2025 at Madison Square Garden while Battle at the Bowl took place the 1st of June 2025 at Hollywood Bowl in Los Angeles billed as canonical event determining whether Fabian Seacaster or Chungledown Bim would die.