Book excerpt: Comics' biggest creators make their mark on the Turtles universe! Go beyond the main series in this exciting anthology of stand-alone stories. Find out what becomes of the Triceratons after the Invasion! Will they get along with their new neighbors or become victims of a terrifying new villain? Plus, can Donatello mediate a truce between the Utroms and the Triceratons, or will fanatics on both sides cause a deadly derailment? The fate of alien life on Earth hangs in the balance! Collects issues #21-25.