He also lent his voice to the character of Lucius Fox for DC Super Hero Girls. He portrayed Aquaman, and voiced other characters in Young Justice, and he voiced Baxter Stockman in the 2012 Teenage Mutant Ninja Turtles. LaMarr portrayed Nautolan Jedi Master Kit Fisto in Star Wars : The Clone Wars on Cartoon Network he also played Amit Noloff, a one time character, and a Tactical Droid. He additionally voices Jazz, Omega Supreme, Oil Slick, and Jetstorm on Transformers Animated. He was also Gabe Wallace, and other characters in Kaijudo: Rise of the Duel Masters. He also voices Wilt and other recurring characters in Foster's Home for Imaginary Friends, Carver Descartes on The Weekenders, Philly Phil in Class of 3000, and he portrayed the character Osmosis Jones in the television series Ozzy & Drix (replacing Chris Rock). LaMarr reprised his role as Hermes Conrad in the Futurama movies Bender's Big Score, The Beast with a Billion Backs, Bender's Game, Into the Wild Green Yonder, and upon the series return in 2010. Besides this he also voiced Black Vulcan in Harvey Birdman, Attorney at Law and Hector Con Carne in Evil Con Carne. LaMarr's voice over credits include a starring role on Justice League and Justice League Unlimited as John Stewart/Green Lantern, a major role as Hermes Conrad and various other characters on Futurama, and the title roles on Samurai Jack and Static Shock. Since July 1, 2020, LaMarr has hosted NASA tv's 'Ask the Astronomers live!' show.

Sometimes, LaMarr fills in for Greg Proops on the Odd News small, a 4-minute section on. LaMarr left Mad TV at the end of the fifth season (2000). He has also done impressions of Moe Howard from The Three Stooges while playing an African-American version of the character.

Howard McNear (as Floyd Lawson from The Andy Griffith Show).

Sherman Hemsley (as George Jefferson from The Jeffersons).

Billy Crystal (as Harry Burns from When Harry Met Sally.).

LaMarr has done impressions of the following celebrities: Some of the recurring characters LaMarr performed on Mad TV were Desperation Lee ('Funky Walker Dirty Talker'), Jaq the UBS Guy, 'sexy player' Rick, talentless R&B singer Savante, and Rocket Revengers star Lieutenant Abraham Jefferson (a.k.a. Even before college, he had voiced a character on the Mister T cartoon show. LaMarr, unlike most of the other original nine cast members of Mad TV, had extensive television and film jobs experience when he joined the show.

He has also improvised with Cold Tofu and Off the Wall. He studied improv at The Second City and at the ImprovOlympic in Chicago with Del Close. After graduating in 1989, he became a member of the award-winning sketch and improv comedy group The Groundlings. One of his biggest roles at Yale was the titular character in the British comedy Trevor. He is a graduate of the Harvard-Westlake School in North Hollywood and Yale University, where he helped found the improv comedy group Purple Crayon.

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