In a 1960 episode of the drama "Bonanza", Davalos played a young man planning to kill his father, a sheriff who had sent him to prison. In the American Civil War television series, "The Americans", broadcast by NBC in 1961, he played Jeff, the younger brother who joined the Confederate Army, in opposition to Ben, the older brother, played by Darryl Hickman, who joined the Union Army. In 1962, Davalos appeared on "Perry Mason" as James Anderson in "The Case of the Hateful Hero." In 1964, he appeared in "The Case of the Ice-Cold Hands." He guest-starred in an episode of the espionage drama series "Blue Light" in 1966. Given the fanfare and notoriety of his cinema debut platformed opposite meteoric legend James Dean, his sporadic performing career has been considered somewhat of a disappointment.