Shark

History

When an atomic pile went out of control at an experimental atomic station, there was an explosion which released radiation and mutated a tiger shark that was swimming close to the shore.  Rapidly, the Shark developed humanoid looks, as well as great psionic powers and human-level intelligence.

The Tiger Shark telepathically absorbed knowlege from the minds of humans, thus learning how to speak.  But despite his newly found abilities, the Shark retained his instinct to hunt and destroy his prey.

However, the Shark soon realized that with all his new abilities hunting humans would be too easy.  He telepathically sought out a victim who would be worthy of him, and he learned of Green Lantern, and how Hal Jordan was supposedly a man without fear.  The Shark decided he would hunt Green Lantern and that before he killed him, Jordan would experience fear.

Green Lantern fought and overcame the Shark before returning him to a normal tiger shark through his power ring commands.  However, this move proved only a temporary measure as the Shark has returned to his humanoid form on several occasions since.  His primary adversary has always been Hal Jordan, but he has also battled other super heroes.  The shark once took the form of an Atlantean and called himself Karshon.  In this guise, he battled Aquaman and temporarily succeeded in usurping the throne of Atlantis from its rightful king.  However, Aquaman overcame him, and the Shark again reverted to his tiger shark form.

Following one battle with Hal Jordan, the Shark was blown to atoms by an explosion.  Guy Gardner managed to put the Shark back together, and the Shark assisted Gardner during the Crisis on Infinite Earths.

Powers and abilities

Karshon has super human strength, endurance, a set of claws, sharpened teeth, and enhanced sense of smell. He can breathe in water as well as on land, swim at up to 60 Miles per hour and fly by psyonically levitating himself. He also has a number of mental powers, such as the ability to instil fear in his victims, manipulate matter, project energy bolts and communicate telepathically.
 

In other media

Justice League Unlimited

Shark in Justice League Unlimited.

Batman: the Brave and the Bold

Shark in Batman: The Brave and the Bold.

Shark makes cameo appearances in Batman: The Brave and the Bold episodes "Night of Huntress" as an inmate at Blackgate Penitentiary and "Mayhem Of The Music Meister".