"Planet Hulk" is a storyline from Marvel Comics that features the character Hulk. In this narrative, the Illuminati, a group of powerful heroes, decide to send Hulk away from Earth to prevent him from causing destruction. He is sent to the planet Sakaar, where he becomes a gladiator and fights for survival. On Sakaar, Hulk gains allies and leads a rebellion against the oppressive regime. He eventually becomes a leader and fights for the freedom of the planet's inhabitants. The story explores themes of exile, power, and the struggle for identity, showcasing Hulk's transformation from a monster to a hero.