Is there any possibility the Big Four will be forced to work together?

I don't think they'd get a monster like Ghidorah and then have a muto be the secret boss enemy. I don't think it would sit well with the fans or general populace. It's like if they made a batman movie with joker then had them work together to stop one random henchman. 

I think the only time I'd like to see the MUTO again is if Godzilla's hunting one or two down like they're cannon fodder. Kind of like Gamera did with the Gyaos in Gamera 3. And then a more powerful enemy be revealed much tougher than the MUTO... like King Ghidorah.

I question why people keep bringing the M.U.T.O.s into everything. People keep wanting monsters like Mothra and Gigan (though I must admit with Gigan it could work) to be related to the M.U.T.O.s or want them to return as the main villains in the sequels. Honestly, I think Legendary is done with the M.U.T.O.s. They served their purpose, and now Legendary has the rights to other Toho kaiju and are moving on.

^Agreed with everything in this post.

Yeah I feel like this film is going to have the same approach Ghidorah The Three Headed Monster had. Godzilla, Rodan, and Mothra will be against each other but when KG touches down they team up. That, or there is just going to be a 4 way throwdown that will leave humanity in ashes :)

''I think the only time I'd like to see the MUTO again is if Godzilla's hunting one or two down like they're cannon fodder. Kind of like Gamera did with the Gyaos in Gamera 3. And then a more powerful enemy be revealed much tougher than the MUTO... like King Ghidorah.'' Gan

agree with every word in that

I don't know....

I feel like the day I see Godzilla and King Ghidorah working together is the day a pig decides to fly. Mothra and Rodan, maybe. But I doubt the two kings are gonna like each other much.

Three vs one.

They have made Ghidorah a good guy In the old films. I think Toho told Lengardary don't turn ghidorah good. But maybe if Toho ever makes a new film we might see that

I remember reading some words from the IDW comic writers, that Toho mandated Godzilla and King Ghidorah always be enemies. Toho considers Godzilla and King Ghidorah foils to each other and arch-enemies. I'm pretty positive the rule would still apply for Legendary. It doesn't matter which side Godzilla and King Ghidorah are on as long as they're fighting.

Exactly. And since Godzilla has already been established as the protagonist monster, I have no doubt Legendary will choose to portray Ghidorah as a villain. The only reason Toho ever protrayed Ghidorah as a hero was because his role in GMK was initially written for Varan, but Toho replaced him with Ghidorah for marquee value.

Yup! I agree. I can't picture Godzilla and King Ghidorah getting along at all, it also includes Rodan and Mothra. Especially if Legendary's going to reinvent them and do a more realistic take on them as animals and being a different species from one another, yeah, the four will not exactly be BFFs. I think it'll be a fourway battle. But about that whole theory with the army of MUTOs, I have to acknowledge that Asian end credits from the first movie with Mothra commanding them, which to this day I haven't seen yet and it's so hard to find so I'm still questioning it's credibility. And why is Mothra being all chummy with them? And about the people still talking about the MUTOs... I don't like them but I'm sorry, they've gotten really popular.

That end credits rumor was complete BS created by a website that makes a living by writing fake stories about movies. I don't know why people still refer to it while we have established repeatedly on every website that it isn't true. I'm pretty sure that even Legendary made a statement about it saying it was completely false.