One of his first film roles was in ‘The Hotel New Hampshire’ in 1984 in which he starred along with Jodie Foster and Rob Lowe. He played a supporting role in the comedy drama.
He auditioned for the role of Young Joe in the Woody Allen movie ‘Radio Days’ and bagged it. The 1987 film received very positive reviews and won several awards.
The success of ‘Radio Days’ ensured that the boy got several film offers over the next few years including: ‘Big Business’ (1988), ‘My Stepmother Is an Alien’ (1988), and ‘Pump Up the Volume’ (1990).
He played the role of Young Richie Tozier in the film adaptation of Stephen King’s horror novel ‘It’ (1990). The performances of the young actors were appreciated though the film itself received mixed reviews.
The 1990s were very productive for the young actor and he had acted in around 15 films over the decade. The major ones among them were: ‘Arcade’ (1993), ‘White Man’s Burden’ (1995), ‘Boys Life 2’ (1997), and ‘Idle Hands’ (1999).
Even after making the transition to movies, Seth continued appearing on television. In 1997, he got the chance to star as Daniel “Oz” Osbourne in the television series ‘Buffy the Vampire Slayer’. The series ran for seven seasons till 2003.
He lent his voice to the characters of Chris Griffin, Neil Goldman and others in the animated sitcom ‘Family Guy’ that centers on a dysfunctional family called the Griffins. The series originally ran from 1999 to 2003. The series was later revived in 2005 because of its popularity.
He lent his voice to six episodes of ‘Batman Beyond’ between 1999 and 2001.
He starred in the television sitcom ‘Greg the Bunny’ as Jimmy Bender, the human roommate of Greg the Bunny, a hand puppet. The show premiered in 2002 and ran till 2006.
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In 2005, he created an animated comedy series ‘Robot Chicken’ along with Matthew Senreich and also provided voices for several characters in the series. The show makes fun of pop culture, movies, television, fashion fads, etc.
He directed ‘Robot Chicken: Star Wars’, a one-off special episode of the comedy series ‘Robot Chicken’ that was aired on Cartoon Network in 2008. Two sequels ‘Robot Chicken: Star Wars Episode II’ (2008) and ‘Robot Chicken: Star Wars Episode III’ (2010) were later made.
He directed and voiced several characters in ‘Robot Chicken DC Comics Special’, a one-off special episode of the ‘Robot Chicken’ series that was aired in September 2012.