"The Crystal At the Heart of the World," Part 3. The Teenage Mutant Ninja Turtles once again team-up with the Wild West C.O.W.Boys of Moo Mesa, but this time the circumstances are more dire, with the fate of the C.O.W.Boys' world at stake, a fate with potential cosmic-wide repercussions! Guest-starring a certain bovine visitor from the "Archie TMNT" universe!