Teenage Mutant Ninja Turtles, Vol. 19: Invasion of the Triceratons

Abducted from their planet millennia ago, the Triceratons are at last free to return home. They come in peace, but how will the world react to a Triceraton "invasion" in the heart of New York City? About how you would expect, especially when the Earth Protection Force gets involved. As the three-pronged attack begins in earnest, it's up to the Turtles to stop the conflict before it escalates into all-out war! Collects issues #76–80.