In 1977, Deezen landed his first role in the film Grease, playing nerdy student Eugene Felsnic. During Grease's post-production period, Deezen was hired for another small role-playing a bully in the low-budget independent science fiction movie Laserblast. Despite being his second film, Laserblast marked Deezen's screen debut when it was released in March 1978, three months before the theatrical release of Grease.
After WarGames wrapped, Deezen worked exclusively in independent film for the remainder of the 1980s, starting with his first starring role in the 1984 cult comedy Surf II: The End of the Trilogy, where he played the movie's antagonist, mad scientist Menlo Schwartzer.
Throughout the 2010s, Deezen appeared in several short films, including as himself in 2012's I Love You, Eddie Deezen, a nervous airline passenger in 2015's Flight Fright and opposite Larry Thomas and Caryn Richman in the short comedy The Love Suckers, which screened at the 2017 New York City International Film Festival. Deezen returned to live-action movies in Fred Olen Ray's 2013 television film All I Want for Christmas in a cameo as a supposed A-list action movie star being interviewed on a daytime talk show. 2b1af7f3a8