Morrow carried over much of his acting persona from his radio days to his film-acting roles, where his ability to rapidly alter both the tone and volume of his voice for dramatic effect frequently gave sound editors fits.

[citation needed] He entered the science-fiction/monster movie genre with This Island Earth (1955), followed by The Creature Walks Among Us (1956), Kronos (1957), and The Giant Claw (1957).

His other appearances were on such series as The Rifleman, Bonanza, Wagon Train, My Friend Flicka, The Deputy, and Daniel Boone.

In 1957, Morrow was cast as Jim Bradford in the episode, "Blood in the Dust", on CBS's Dick Powell's Zane Grey Theatre.

His wife Lucy (Claudette Colbert), is particularly distressed because Jim has not shot a weapon since he was in the American Civil War.

During the '60s and onwards, Morrow appeared in such films as Harbor Lights (1963), the Italian comedy Il giovane normale (1969), Blood Legacy (1971), and in a bow to his earlier career, a cameo in the 1971 monster film Octaman for veteran 1950s monster movie writer/director Harry Essex.