http://www.darkhorizons.com/caruso-talks...crossover/

I know it happened in the comics. The only episode I recall from either "G1" cartoon series was a Cobra Commander spotting in one Transformers episode in I want to say S3 (but might have been a late S2). And it didn't really put the "GI Joes" in it"

As far as the take on the performance of the two GI Joe movies... I think in the transition to live action they went a little "too" sci fi in the first one. The 2nd one was a better overall movie. Personally, with all the main characters for the Joes and the Cobras they could have a good "all star" movie and it shouldn't be too hard to do as long as they stay away from Serpentor, Cobra La, and some of the crazy stuff Dr. Mindbender got into as well as some of the off characters like Croc Master, Big Boa, and Raptor(?).