History: (Showcase #11) - The warlike Tyrans sent an expedition to Earth, led by Gen. Tolek in order to conquer the planet. Operating out of an underground base in the Antarctic, they planted a number of explosives offshore of Earth's continents and drilled three massive shafts carved into the Earth. They planned on dropping massive bombs into the shafts, blowing Earth's core into space and causing Earth's gravity to become lighter like their own home world. Tyran scientist Garnat always kept a few subjects of the worlds they devastated, and kidnapped scientists Carl Jackson and Warren Moss, who were exploring the Antarctic. Washington, D.C. was concerned about the missing scientists, and called in the Challengers of the Unknown to find them. The Tyrans captured the Challs, and Garnat decided to keep them alive as test subjects, going so far as to explain the entire plan of the Tyrans to them. Ace Morgan hypnotized Garnat, and had him turn off the gravity sphere inside the base, and in Earth's gravity the Tyrans could barely move. Using the electronic transmitter the Tyrans used to come to Earth Prof. Haley and Red Ryan went to Washington, and with the aid of the military destroyed the offcoast explosives. The Tyrans released an amphibious war machine that the Challs destroyed. Rocky Davis and Ace damaged the detonator for the bombs to be dropped in the Earth's core before using the transmitter to escape, and the exploding detonator killed the Tyrans.

Comments: Created by Jack Kirby.