Ernest Kinoy and George Lefferts adapted most of the stories and also provided original scripts.
Holmes was a regular voice actor in the 1950s science fiction radio shows Dimension X and X Minus One.
Episode 30 of the radio drama Dimension X, "Universe", featured a seed ship whose human population had split into the lower deck inhabitants and the upper deck inhabitants.
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The book was adapted for radio by Ernest Kinoy for Dimension X as "Pebble in the Sky"; first broadcast in 1951 it was released as an audio download in 2007 by Radio Spirits, and again in 2011.