616 comics Marvel.
Rules:
Marvel is aware that something is coming to attack them, but they don't know what. Basic Knowledge of opponents is off for both sides.
All heroes and villains are in their respective bases of operation. So the X-Men are in the mansion, Avengers are in their tower and so on.
They are given 10 seconds to prepare themselves for combat. So flipping automated defenses into position, red alert status.
Typically terrestrial heroes and such that are off world at the time, are brought back. Typically cosmic people are sent off world (I don't mean Thor, more like if Surfer is in one of his weird phases of hanging around Earth, he gets booted back into space lol).
Franklin Richards is on the planet but is "in-character" not bloodlusted.
If people happen to have an Infinity Gauntlet, Cosmic Cube or the like hanging around, it is excluded. I want more typical weapons/resources in play.
The Shrike appears in Portland Oregon, bloodlusted and intending to kill every living thing. Discuss!
*it should be noted, I'm not expecting Shrike to win. This is more of a "how far does he get" sort of thing. I've just read his books again and wanted to talk about him while its fresh in my mind. =)
edit: no MAD situations lol. Like, Earth has to survive. No just blowing it up as a win :P