Welcome to another exciting edition of Creature Double Feature, a fond look back at the type of weird and wonderful monster movies that used to be broadcast Saturday afternoons on Boston’s WLVI-TV 56. Today we’ve got twin terrors from 1957, one beneath the sea, the other above the skies. Let’s dive right in with THE MONSTER THAT CHALLENGED THE WORLD, a soggy saga starring former cowboy star Tim Holt and a monstrous giant sea slug!

An earthquake has released the beast in California’s Salton Sea, and when a Navy parachutist and a rescue crew goes missing, Commander “Twill” Twillinger (Holt) investigates. A mysterious, sticky white goo is found on board (no “money shot” cracks, please!), and a sample is taken to the lab of Dr. Rogers (Hans Conreid). Rogers analyzes the substance, a “simple marine secretion” (again, no wisecracks!), later discovered to be radioactive.

Rogers’ secretary Gail (Audrey Dalton) and Twill get off…