Published in 2006 and written by Greg Pak with art by Carlo Pagulayan and Aaron Lopresti, Planet Hulk appeared in The Incredible Hulk issues #92-105. The story begins with the Hulk being deemed too dangerous for Earth, leading to his exile by the Illuminati. He is sent to the planet Sakaar, where he is initially enslaved and forced to fight in gladiatorial battles.
Over time, Hulk becomes a leader, overthrowing the tyrannical Red King and becoming the ruler of Sakaar. Key characters include the Hulk, the Red King, Caiera the Oldstrong, and the Warbound, a group of fellow gladiators who become Hulk's allies.
Planet Hulk set the stage for the subsequent World War Hulk storyline. It was adapted into an animated film in 2010.