He wrote and directed The Angry Red Planet (1959) and The Time Travelers (1964), and co-wrote Reptilicus (1961), Journey to the Seventh Planet (1962) and Robinson Crusoe on Mars (1964).
For television, he wrote two episodes of Men Into Space, “Water Tank Rescue” (1959) and “Voice of Infinity (1960), as well as “The Premonition” episode of The Outer Limits (1965).
He also claimed to be the creator of the original idea upon which Irwin Allen based the TV series Lost In Space, an allegation documented in Ed Shifres’ Lost in Space: The True Story.
He was the son of opera singer and movie star Lauritz Melchior, about whom he wrote a biography, Lauritz Melchior: The Golden Years of Bayreuth.
In recent years he was a regular at the annual LA Vintage Paperback Show.