Career
Nemec began training with the Centre Stage LA theater company and signed on with an agent after performing in one of its talent showcases. He was booked for several commercials, such as Suzuki, and landed a guest-spot on the TV show Sidekicks starring Ernie Reyes Jr., with whom Nemec remained friends. His first major film role was Tucker: The Man and His Dream in 1988. He appeared in several TV shows, earning an Emmy nomination for his portrayal of Steven Stayner in the NBC miniseries I Know My First Name Is Steven. He starred alongside Jack Palance, Peter Boyle, and Charlton Heston in the 1990 feature film Solar Crisis.
Nemec played the lead in the TV series Parker Lewis Can't Lose from 1990 to 1993. Also, in 1993, Nemec was cast as Harold Lauder in a TV adaptation of Stephen King's The Stand. In 1997, he played a notable role in the movie Goodbye, America. He also starred in the TV movies My Brother's Keeper alongside Jeanne Tripplehorn and Blackout with Jane Seymour.
Nemec made appearances on several TV shows, including Tales from the Crypt, Smallville, CSI: NY, CSI: Miami, Supernatural, and Ghost Whisperer. He also portrayed the serial killers Richard Speck and Ted Bundy. He played leading parts in some original Sci Fi Channel (United States) made-for-TV movies such as Sea Beast, Mansquito, SS Doomtrooper, Dragon Wasps, and Lake Placid vs. Anaconda and some original movies for Lifetime (TV network).
During the 1990s, Nemec had a brief foray into hip hop, recording an entire album with the group Starship of Foolz, developed by Matt Robinson and Dedra Tate, and produced by actor Balthazar Getty. Nemec produced a new comedy series that starred comedian Paul Mooney, father of fellow Starship of Foolz member Shane Mooney, as the President of the United States. He appeared in the music video "Beer for My Horses" by Toby Keith and Willie Nelson.
In 2002, Nemec made a guest appearance in season 5 of Stargate SG-1 playing Jonas Quinn, a human scientist from Collona. During that season Michael Shanks, then playing Daniel Jackson, had grown tired of his character being sidelined, and was killed off late in the season, with his role being replaced by Quinn and Nemec. Shanks’ departure saw outrage from fans of the show, and as such Nemec was poorly received. Shanks and the studio eventually made a deal, and Jackson was resurrected in season 7 to re-replace Quinn. Nemec as Quinn made a guest appearance teaming up with Jackson in season 7, but the character wasn’t seen again after that episode in 2004.
With his close friend, actor David Faustino of television sitcom Married... with Children, he has a production company that co-produced the debut album from Austin-based band Hollow, featuring Jon Dishongh. Nemec and Faustino co-starred in Star-ving, a web series that spoofs HBO's Entourage.