Goof: When Buck is entering the cave, if you listen carefully you can hear street noises in the background.
This two part episode bears a striking similarity to the 1970 movie Beneath the Planet of the Apes—another movie about a space man frozen in his ship then awakened in the future. They share several other aspects including a radioactive mutant subterranean madman bent on world domination.
This episode appears on the DVD in it's original 2-hour movie format
Buster Crabbe, who plays "Brigadier Gordon" in this episode, is most famous for playing Buck Rogers in the original 1930s series.
Since this episode was originally a 2 hour TV movie the same credits were used for parts 1 & 2 of the syndicated version. Therefore, although credited, Buster Crabbe (Brigadier Gordan) did not appear in part 1.
This episode originally aired as a 2 hour TV movie.