The idea of a Transformers and G.I. Joe crossover movie has floated around Hollywood for many years. Even Dwayne Johnson wanted to make it at one point. But after not making any progress on that front, Paramount signaled that this mash-up was in audiences' futures with Transformers: Rise of the Beasts ' ending .

The Transformers & G.I. Joe crossover movie seemed to gain steam quickly, with Derek Connolly signing on to write and Chris Hemsworth reportedly joining the fold as a main cast member. However, Steven Caple Jr. stepped back from directing duties, and the now-established Skydance and Paramount merger left the movie in an uncertain position.

Even as Michael Bay's Transformers return gained momentum, there was still an expectation that Paramount would make th

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