John George Agar Jr. was an American film and television actor. He is best known for starring alongside John Wayne in the films Sands of Iwo Jima, Fort Apache, and She Wore a Yellow Ribbon. In his later career he was the star of B movies, such as Tarantula!, The Mole People, The Brain from Planet Arous, Revenge of the Creature, Flesh and the Spur and Hand of Death. He was the first husband of Shirley Temple.

Revenge of the Creature is a 1955 3D monster film directed by Jack Arnold and produced and distributed by Universal-International. A sequel to the previous year's Creature from the Black Lagoon, it is the only 3D film released in 1955. Produced by William Alland, the film stars John Agar, Lori Nelson, John Bromfield and Nestor Paiva. The Creature was played by Tom Hennesy on land, and once again, portrayed by Ricou Browning underwater. It marked an early role for Clint Eastwood, in his film debut.