Phoebe Cates was cast as Kate, Billy's girlfriend, despite concerns that she was known for playing more risqué parts, such as Linda Barrett in "Fast Times at Ridgemont High" (1982). Spielberg urged the casting of the relatively unknown Zach Galligan as Billy because he saw chemistry between Galligan and Cates during auditions. Galligan later compared himself to Billy, saying he was a "geeky kid", and that being in the film "was really kind of a dream" given "what I get to do, what my character gets to do, blow up movie theatres", adding that he "got to work with great people". Spielberg commented when Galligan was testing with Cates that "he's in love with her already" and that was how Galligan won the part.