Green is a co-creator, co-producer, writer, director, and most frequent voice of the Emmy-winning stop-motion sketch comedy TV series "Robot Chicken", for which he does many voices and has appeared in animated form. Green is friends with the band Fall Out Boy, making a cameo in their music video, "This Ain't a Scene, It's an Arms Race". He also appeared in "Weird Al" Yankovic's "White & Nerdy" music video. He made two appearances on "The Soup" in 2007 and 2008, using his first appearance to lampoon Internet celebrity Chris Crocker. He voiced the character Jeff "Joker" Moreau, pilot of the "SSV Normandy" and later the "Normandy SR2", in the video games "Mass Effect", "Mass Effect 2", and "Mass Effect 3". He is a producer of "The 1 Second Film" and appears in the "making of" documentary that accompanies its feature-length credits. Green is also the co-creator (with Hugh Sterbakov) of the comic "Freshmen", published by Top Cow Productions.