Speaking to Collider to promote Vin Diesel's xXx: The Return of Xander Cage, director D.J. Caruso, who was hired to direct G.I. Joe 3 back in January 2015, has confirmed that the initial script for the "threequel" called for something fans have been requesting for years - a crossover with the Transformers franchise. However, two things happened; Paramount decided to form a writer's room to develop ideas, in a repeat of the process used to hammer out the script for Transformers: The Last Knight. The other hang-up, is that Michael Bay got wind of the idea and apparently vetoed it.
"Well yeah but they’re not ready to do [G.I. Joe meets Transformers] yet. That’s exactly what they should do but they’re not ready to do that because in fact the script that I was developing, the two worlds sort of collided at the end and when they read it they were like, ‘We’re not ready to do this yet.’… They will eventually collide those two worlds and it’s probably when Mr. Bay decides he’s done with Transformers."
Michael Bay has given indication on the last two Transformer releases that it was his last time directing an installment in the franchise so there's currently no reason to think The Last Knight is his last hurrah. Caruso went on to add that the Transformers/G.I. Joe crossover came pretty close to receiving a greenlight before Paramount opted to create a writer's room. Now that he's wrapping up promotional work on xXx, Caruso said he'll soon sit down with Paramount again to discuss the status of the project.
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