Why is there a red Hulk?

Red Hulk was imprisoned, and Hulk called in Steve Rogers to give his enemy a chance at redemption. Scorched Earth Ross' time to prove himself would come as a backup plan of the Leader's and M.O.D.O.K.'s automatically initiated after their defeat. read more

The first incarnation of Red Hulk (also known as Rulk) first appeared in the Hulk series that debuted in 2008. The 2010 "World War Hulks" storyline reveals that this being is United States Army General Thunderbolt Ross, the father-in-law and longtime nemesis of the original Hulk, Bruce Banner. read more

In battles against the Green Hulk, the Red Hulk's power would increase since the Green Hulk emits low-level gamma rays all the time. Where they differ is the amount of radiation output both generate. While the Green Hulk always generates a certain amount of gamma radiation, the Red Hulk's energy output is significantly higher. read more