As you may be able to tell, the Transformers and G.I. Joe co-exist in one universe where I come from. Therefore, all TFs and their associated characters are in my G.I. Joe world.

Besides them, pretty much everyone from the comics and TV shows exists in one way or another. I haven't fleshed them all out, and likely won't until I decide to use them in a story, but all the following inhabit my world in one way or another:

Cobra-La is out there someplace, though it likely has no real connection to Cobra in my world. Perhaps, as in the cartoon, they planted the seed of Serpentor's creation in Dr. Mindbender's "rather pedestrian" brain (to quote Golobulus), but it would've been more to try and seize control of Cobra than from any past association with their leader. Cobra Commander is 100% human around these parts!

Also, Action Force is in my Joe world as the U.K.'s equivalent of G.I. Joe. There's a reason Big Ben hasn't been in any of my TF crossovers even though he's one of my favorite Joes-- He's a member of Action Force. Lt. Stone (based on the Sigma Six character) is their leader, even though I haven't made a figure of him yet. Naturally, since Action Force exists, so do the Red Shadows.

Finally, since you can never have too many ruthless terrorist organizations out there, even though G.I. Joe Extreme isn't in my world, their enemy organization, SKAR, is, led by Iron Klaw. I'll probably never use them in anything, but Iron Klaw is just too cool-looking not to acknowledge. Someday I plan to make a custom of him using a Cobra CLAWS head with a beret.

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is on indefinite hiatus...