He is well known for being the motion capture actor of Master Chief in Halo 4, Halo 5: Guardians and Halo Infinite as well as portraying Russell Adler in Call of Duty: Black Ops Cold War.
2000
He first came to prominence for portraying the character of Batman in a series of commercials for General Motors' OnStar service that aired from 2000 to 2002.
He was featured in Legally Blonde, as well as its sequel Legally Blonde 2: Red, White & Blonde, as the "UPS guy".
2006
He co-starred on the ABC Family original series Kyle XY as Stephen Trager from 2006 to 2009.
2008
He was featured in the 2008 film Babysitter Wanted.
He starred as JP Gratton in the episode "The He in the She" in the series Bones on October 8, 2008.
Thomas has also been featured in the sitcom Wings as well as on Weeds.
He most recently provided the voices of Atrocitus in Green Lantern: Emerald Knights, Ezra Loomis in Gears of War: Judgement, Desaad in Justice League: War, and James Gordon in Son of Batman.
2012
He provided motion capture for Spartan John-117, the protagonist of the video game Halo 4 (2012), also doing so for Halo 5: Guardians (2015) and Halo Infinite (2021).
It has been erroneously reported in the past that Thomas played Batman for the pilot and premiere of The WB's Birds of Prey TV series.
Thomas personally dispelled this fact during a podcast interview.