History: (Challengers of the Unknown I #11) - The Aktonites theorized there were other dimensions, and proved it when they discovered the Earth dimension, inventing a dimensional exchange machine to explore it. The bellicose offplanet species the Zarxes invaded, conquering the Aktonites and seizing control of the machine. They planned on scouting out Earth before invading the planet. June Robbins was on an archaeological dig in the Caribbean with Prof. Markson, Spaatz and Cleary when they saw a glowing light atop a hill. Cleary and Markson walked into the light, disappearing, and two Zarxes emerged. June called the Challengers of the Unknown, who engaged the aliens, only to be driven back by the beings eye-blasts. Rocky and Red decided to investigate the glowing light, and also disappeared, only to be replaced by two more Zarxes. Rocky and Red found themselves in the Aktonite dimension, and were held captive by the Zarxes. They were imprisoned with Markson, Cleary, and an Aktonite scientist. The scientist told them how they were conquered by the Zarxes. Rebel Srella helped them escape and brought the rest of the Challs to the world. The Zarxes needed full sunlight to function, so they blew up the artificial sun in the city that kept the invaders going. The Aktonites retook their dimensional machine, and after returning the Challs home promised to destroy the gateway.

Comments: Created by an unnamed writer & Bob Brown.