Marvel/DC Alliance Fantastic Four VS. Thanos

Marvel/DC Alliance FF4:

Professor Hulk
Green Lantern Hal Jordan
Beta Ray Bill(From Stormbreaker)
Firestorm

VS.

Thanos

Who takes it? Heroes get a week of prep and to devise a strategy. Thanos has no prep whatsoever. Yeah, Thanos is that powerful. Battle takes place on earth size planet with an atmosphere similar to earth.

Debate.

hm...professor hulk should be able to keep thanos busy long enough for the other three to cook up an attack, though who knows how they're going to do enough damage to put down thanos.