Godzilla. Not only is he just as invincible as the Hulk (can regenerate from a single amino acid according to Godzilla 2000's Regenerator G-1), but he has survived having [I]black holes[/I] launched at him. He shook off the first one and blew up the second one. In the [I]same movie[/I] (Godzilla vs. Megaguirus).