Member of the Challengers of the Unknown.
Walter "Prof" Haley is the leader of the Challengers of the Unknown team.
Honorary member of the Challengers of the Unknown
Multi-Man is immortal, gaining a new superpower every time he comes back to life. However, he never knows what that power will be.
Enemy of the Challengers of the Unknown.
Jetsetter, maid of mystery.
Robotic member of the League of the Challenger-Haters
Botanist Alec Holland became the avatar of the Green, known as the Swamp Thing, following his death in a swamp as a result of a horrific accident. With the ability to control any form of plant life, Swamp Thing uses his powers to protect both the human and the plant worlds.
After being murdered by the League of Assassins during a performance, circus acrobat Boston Brand was turned into a ghost by the Hindu goddess Rama Kushna. Becoming the superhero Deadman, Boston must aid the people he possesses to avoid eternity in Hell. He is currently part of Justice League Dark.
Drabny is a member of the League of Challenger-Haters.
Rip Hunter is the son of Booster Gold and the DC universe's leading authority in time travel. With his origins and true identity a mystery, so as to safeguard himself from time-traveling villains-- he defends timestream as a Time Master!
Giant female robot created by Multi-Man. She rebelled against her creator and struck out on her own.
M'Nagalah was an ancient and powerful cosmic being.
A one shot character from a Challengers of the Unknown story during the pre-Crisis universe.
Sponge Man was a living weapon of mass destruction that Scorpio wanted to control and had it attack both the Sea Devils and the Challengers of the Unknown
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