Dimension 20 is known for epic storytelling, absurd comedy, and moments that punch you right in the feelings. But a huge part of what makes it so unforgettable is its core cast—a wildly talented group of improvisers, comedians, and storytellers. If you’ve laughed, cried, or gasped during a Dimension 20 season, odds are it’s because this cast knows how to bring it.
Let’s dive into some fun, quirky, and surprising facts about the Dimension 20 cast—the Dungeon Master Brennan Lee Mulligan, along with the intrepid heroes Emily Axford, Brian Murphy, Zac Oyama, Siobhan Thompson, and Lou Wilson.
Brennan Lee Mulligan: The Mastermind DM
He's Been DMing Since He Was 10
Brennan started running tabletop games as a kid, and his storytelling roots go deep. He even taught tabletop RPGs at New York’s Story Pirates. His experience shows in every twisty narrative arc he builds.
He Was on CollegeHumor Before Dimension 20
Before becoming the internet’s favorite Dungeon Master, Brennan was a writer and actor on CollegeHumor—he’s behind tons of iconic sketches.
He’s a Human Lore Encyclopedia
Seriously. Ask him about political systems in a fantasy city he made up two minutes ago and he’ll have a 10-minute answer ready. It’s part of his magic.
Emily Axford: Chaos Queen With a Heart
She’s Co-Creator of Hot Date
Before her Dimension 20 fame, Emily co-created and starred in Hot Date, a sketch comedy show on PopTV with her husband Brian Murphy.
She’s a Multitalented Musician
Emily has composed music for CollegeHumor sketches and even for Dimension 20—yes, she’s behind some of the D20 jingles!
She Leans Into Chaos in Real Life Too
Emily’s gameplay may feel unhinged at times (Fig Faeth, anyone?), but that blend of chaos and cleverness is all her.
Brian Murphy: Deadpan Delivery and the Most Forgiving DM
He’s Married to Emily Axford (and They’re an Iconic Duo)
Brian Murphy—affectionately known to fans as “Murph”—is half of one of Dimension 20’s most beloved pairings. His real-life marriage to Emily Axford translates into on-screen chemistry that fuels everything from bickering NPCs to heartfelt adventuring partners.
He Co-Hosts Not Another D&D Podcast
When he’s not playing characters on Dimension 20, Murph serves as the Dungeon Master on Not Another D&D Podcast (NADDPOD), where he leads Emily and friends through hilarious and heartfelt campaigns. The podcast has built its own massive following, showing off Murph’s worldbuilding chops in longform.
He’s Famously Lenient Behind the DM Screen
Emily Axford has often joked that Murph is a very forgiving Dungeon Master—especially compared to Brennan. He leans toward letting the story flow, allowing players more wiggle room to experiment (and sometimes get away with chaos). That chill DM style is part of what makes NADDPOD so beloved.
Siobhan Thompson: Sharp, Smart, and Surprisingly Brutal
She’s a Shakespeare Nerd
Siobhan trained in classical theater and has a soft spot for Shakespeare. That refined edge gives her characters depth and gravitas.
She Wrote for Rick and Morty
Siobhan’s writing chops are no joke. She worked in the writer’s room on Rick and Morty—and that dark humor definitely shows in her gameplay.
Her Characters Always Surprise You
From Kristen Applebees to Misty Moore, Siobhan’s characters might start soft, but they always have bite.
Zac Oyama: Understated and Underrated
He’s a UCB Veteran
Zac honed his comedy at Upright Citizens Brigade, where many of the Dimension 20 cast also got their start. His improv game is razor sharp.
He’s More Than Just the Quiet Guy
Zac tends to play the straight man or the "reluctant hero," but when he cuts loose—like in Tiny Heist or Coffin Run—it’s unforgettable.
He’s Also a Writer and Actor
You might have seen Zac in The Good Place, Sherman’s Showcase, or writing for Adam Ruins Everything.
Lou Wilson: Heart, Hype, and Big Hero Energy
He’s a TV Writer and Actor
Lou was a staff writer on Jimmy Kimmel Live! and has acted in shows like American Vandal and The King of Staten Island.
He’s the Soul of Many Campaigns
Lou’s characters often bring heart and emotional stakes. Kingston Brown in Fantasy High: Sophomore Year? Instant legend.
He Loves the Game, Even When He Loses
Lou brings sportsmanship, camaraderie, and vibes to every season—even when the dice don’t love him back.
Why the Dimension 20 Cast Works So Well Together
A Foundation in Improv Comedy
Most of the Dimension 20 cast came up through improv—particularly at UCB. That background means they’re excellent at reading each other’s energy, building scenes together, and letting the story evolve organically.
They Genuinely Love Playing Together
The chemistry is real. Off-screen friendships translate to on-screen magic, and fans can feel the fun they’re having every step of the way.
They Balance Chaos and Storytelling
Each cast member brings a unique style—chaotic, heartfelt, dramatic, or hilarious—but they all know how to support a shared story. That balance makes Dimension 20 so addictive.
Want More Than Just Watching? Start Your Own D&D Game
Getting inspired by the cast’s creativity? You don’t need a set or a camera crew to start your own campaign. Grab some dice, a character sheet, and friends, and dive into the fun.
Check out starter kits and dice sets on Amazon to begin your journey:
- Dungeons & Dragons Starter Set: Dragons of Stormwreck Isle
- Dungeons & Dragons Essentials Kit
- Koplow Games Rainbow Polyhedral Dice 7 Piece Set
Who knows—you might have your own Dimension 20-style story waiting to unfold.
Get to Know the Cast—Then Roll the Dice Yourself
The Dimension 20 cast isn’t just talented—they’re dynamic, funny, emotionally resonant, and incredibly smart players who make every game better. Whether you’re a long-time fan or just diving in, knowing more about Brennan, Emily, Murph, Siobhan, Zac, and Lou only enhances the experience.
So rewatch your favorite season, binge some Adventuring Party behind-the-scenes chats, or let their stories inspire your own D&D night. There’s no wrong way to be a fan—just roll with it.
