Necrosha

"Necrosha" is a 2009–10 comic book crossover storyline published by Marvel Comics featuring the X-Men family of characters. In the storyline, Selene decides to utilize the techno-organic virus power to bring any deceased mutants back to life, allowing her to begin her quest to ascend to godhood. This prompts multiple mutant teams to fight against Selene in an attempt to free the newly resurrected mutants. The storyline is notable for reviving a vast majority of its characters.