Mysteries grow richer as an alien creature makes its presence known in Venezuela. The strange vehicle Casey, Raphael, and Donatello find leaves behind questions about what happened to its previous occupants. And Michelangelo turns heads as he takes to the skies with a man who appears to be an angel! All of this and more rip-roaring action in the reprint of the legendary fourth volume of Teenage Mutant Ninja Turtles!