In 1973, Rhodes co-starred in an episode of the cult sci-fi drama The Starlost (Episode 12, 'The Implant People').
This led to collaborative efforts like the novel Phoenix Without Ashes, based on Ellison's pilot script for The Starlost.
He also gave memorable performances in 1966 in The Secret Storm, as the unscrupulous Thomas Cromwell in the 1969 film version of Anne of the Thousand Days and as the governor of Umakran in the episode "The Goddess Calabra" from the 1973 TV show The Starlost.
He appeared in the episode "The Pisces" of the short-lived TV show The Starlost (1973), and was Commandant Leiter in the Battlestar Galactica original series episode "Greetings from Earth".