When Cruz was 6 years old, he started to take acting seriously, as he beat out 65 other child actors for the role of Eddie Corbett in The Courtship of Eddie's Father. After Courtship, Cruz guest-starred on a few TV shows, and was reunited with Bill Bixby on The Incredible Hulk, while he was growing up. After his guest-starring roles, Cruz had retired from acting in 1980, at age 18, to focus on a music career to shed the squeaky-clean Eddie image.In the 1980s, Cruz fronted a hardcore punk band from Oxnard, California called Dr. Know, which released several records. He later joined the Dead Kennedys as lead vocalist, replacing Jello Biafra. He quit the Dead Kennedys in 2003. Jeff Penalty took his place, and Cruz rejoined Dr. Know, which continues to perform, and has a new CD in the works. After quitting the newly formed Dead Kennedys, Cruz played a show at Tompkins Square Park with several bands including Choking Victim and Millions of Dead Cops.