........

[Clarke]

Originally Posted by Fighter-of-Wars

I'm going to have to agree with the above.

I just wouldn't work, I mean, how could it work? Ikran's taking out decepticons, with Na'vi using weird guns from Half Life. A fun idea, but not a good one.

It becomes a far better idea if you take out the Transformers. New Black Mesa already have the altnerate-universe teleporters, so a story about them meeting the Na'vi would be easy enough. You could also have an entirely separate plot thread about the mess that results when the Combine meet Eywa.