Underdog (1964)

Episode Overview

Title: The Marbleheads, Part 1 Plot: An unidentified object plummets to Earth, capturing the attention of a team of researchers. Upon investigation, they conclude that it’s a benign, lifeless comet. Satisfied with their findings, the scientists depart, oblivious to the hidden portal that has activated within the object. From this concealed entrance, two sinister extraterrestrial beings step out, ready to unleash their agenda on the unsuspecting world.