6 Times Marvel And DC Shamelessly Ripped-Off Each Other's Stories

Marvel's Necrosha (Oct 2009):

Necrosha is a crossover story arc that came out in the same year as (but most certainly after) Blackest Night. It was teased for a short time in the pages of X-Force and began in earnest with one-shot X-Necrosha in October 2009. The continuing story follows Selene, the Black Queen of the Hellfire Club, as she gains access to the Technarch transmode virus and uses it to resurrect a number of dead mutants.

While the antagonist's goal in Blackest Night was to be the master of all life, Selene's similarly grand plan is to assemble an army of the resurrected and use them to become a Goddess. With her new Inner Circle of Blink, Mortis, Senyaka, Wither and Eli Bard, Selene manages to keep her enemies busy long enough for her to head to the island of Genosha (soon rechristened Necrosha) and resurrect millions of dead Genoshan mutants in order to sacrifice their souls.

In the end Warpath and the X-Force use the Ghost Dance - a ritual taught to them by Ghost Rider that kills evil spirits - to attack Selene's Inner Circle, killing two and scattering the rest. Warpath himself stabs Selene, who explodes into a rays of light and dies, taking the effects of the virus with her.

DC's Blackest Night (June 2009):

This crossover from DC consists of an eponymous, central miniseries and a number of tie-in books. DC's take on the undead begins when the Black Hand, chosen by the Black Lantern battery as a mortal coil, removes the skull of Bruce Wayne from his grave and recites an incantation that promises the coming of the Blackest Night. With this, every deceased superhero and villain receives a Black Lantern ring and proceeds rise from their graves.

The Green Lantern and the Flash, who were visiting Batman's grave only moments before it was desecrated, lead the charge against the undead, with Flash using his abilities to warn every hero on the planet that their former allies and enemies have returned as evil corpses.

Members of the Justice League and the various Lantern Corps arrive to bolster the numbers, but even they seem to be no match for Nekron of the Black Lantern core.

Nekron plans to make contact with the Entity, the cause and source of all life in the universe which began on Earth. His plan backfires, however, when the Entity takes the side of the living and transfers its power into every ring it can reach, creating the White Lantern corps.

As the Marvel heroes used the Ghost Dance to defeat the ringleader of the zombies, so the DC ones use the power of the Entity, and the undead were able to rest in peace.