Seth Green (born Seth Benjamin Gesshel-Green) is an American actor, comedian, voice actor, producer, screenwriter, and director who is best known for creating and voicing various characters on the Adult Swim stop-motion animated comedy series Robot Chicken, where he is also the writer and director, and for voicing Chris Griffin on the Fox animated sitcom Family Guy since 1999. He is also known for his roles as young Richie Tozier in the 1990 horror film It, Scott Evil in the Austin Powers films, and as Daniel "Oz" Osbourne on The WB/UPN television series Buffy the Vampire Slayer from 1997 to 2003.
He played Craig White in the 2009 Disney comedy film Old Dogs, Chuckie Miller in Can't Buy Me Love, Selby in Enemy of the State, and the motion-capture of Milo in the 2011 Disney animated film Mars Needs Moms. In 1988, he portrayed Jason in the Touchstone Pictures movie Big Business. He also voices Monty Monogram in Phineas and Ferb, Rick Jones/A-Bomb in the Marvel animated series Hulk and the Agents of S.M.A.S.H., Linus in the ABC TV show Castle, and Howard the Duck in the 2014 film Guardians of the Galaxy.