Muppetbabies - Undersea Kingdom

Undersea Kingdom is a 1936 movie serial produced by Republic Pictures to compete with Universal Studio's Flash Gordon series. It marks the first appearance of the "Republic Robot" which was used in several Hollywood films including Mysterious Doctor Satan (originally scripted as a Superman serial, and spoofed sixty years later on Star Trek: Voyager's recurring "Captain Proton" stories).


  • Another series of clips were used in "Journey to the Center of the Nursery" where the Babies use a tank from the film to get around under the surface of the Earth. A squadron of robots from the film act as guards over the Babies as they're forced into salt mining.