Prendergast had previously appeared on the television series T.J. Hooker, starring Star Trek: The Original Series actor William Shatner, Star Trek: Deep Space Nine actor James Darren, and TNG and Star Trek: Voyager guest actor Richard Herd. He was also seen in a 1982 episode of Trapper John, M.D. along with Robin Gammell, Salome Jens, and series regular Madge Sinclair. His other TV credits include Houston Knights (starring Madlyn Rhue), Matlock (with Jason Wingreen), and Simon & Simon (with Olivia d'Abo and Tina Lifford) as well as the 1981 TV movie Thin Ice with Daniel Hugh Kelly and Dwight Schultz. He was also a regular on the short-lived soap opera Generations, along with Paul Carr, Bruce Gray, Marnie McPhail, France Nuyen, and Joan Pringle.