A deadly plague is ravaging the Earth, known as the Purple Death because of the spot left on victims' foreheads.

They met on Earth 238, also known as the Crooked World.

The planet is notable as it has the closest radius to Earth known so far.

Somehow this creature sucks them into the other Earth known as Rikyu.

He is set on having the demon race reborn on Earth, otherwise known as Xenogenesis.

Based on the parallel Earth known as Earth-S, the Squadron's members are the following superheroes:

Also, the sizes and other characteristics of these features seemed to be similar to comparable minerals on Earth known to have biological origins.

Bounce Rock bears a striking resemblance to a class of meteorites found on Earth known as shergottites, that are believed to have originated from Mars.

"The Badlands are a region on Earth known for their distinctive erosional formations."

Captain Britain was sent to an alternate Earth, known as Earth-238, by Merlyn.