Marvel officially announces X-Men and Fantastic Four crossover ahead of 'Doomsday'

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Probably fair to say that the X-Men and the Fantastic Four don't exactly have a straightforward relationship at this point. Sometimes they're best buds while other times they're neighbors eyeing each other over the garden hedge with suspicion at what the others are up to. And then again, sometimes Reed Richards sticks his super elasticated and bendy nose in mutant business where it doesn't belong and everyone rightfully gives him bombastic side-eye. However, this September, the two teams are joining forces against a threat that sounds genuinely horrible even by Marvel standards.