The Destiny War was a conflict in the fictional Marvel Universe between Kang the Conqueror and his future self, Immortus, and transpired in the Avengers Forever limited series.

It was ignited when Immortus sent his servant Tempus to kill an apparently critically ill Rick Jones on the moon, knowing that it was the Destiny Force about to manifest within him for the second time (after the first time during the Kree-Skrull War) that was killing him. Kang intervened, and the Kree Supreme Intelligence, who Rick had been brought to for examination, triggered Rick to use the Destiny Force to call a team of Avengers to him, plucked from time, causing Immortus' forces to withdraw, having failed to prevent what they had come to do.

At the conclusion, Rick and this team of Avengers fought by the side of Libra , Kang and the Supreme Intelligence against Immortus and the Time Keepers . The Time Keepers killed Immortus for his failures, and attempted to accelerate Kang into Immortus - and instead, split Immortus off from him, meaning Kang would never now become him. Rick burnt himself out stopping their plan, and Kang proceeded to kill the Time Keepers. Rick was then merged with Genis-Vell, the third Captain Marvel, to save his life, and he and all the Avengers were returned to their original time periods with varying degrees of memory as to what they had been involved in.