Mega Dino Battle is full-length team-up special for Power Rangers Super Dino Charge. It marks the return of the Megaforce/Super Megaforce Rangers. The episode involves a revived Vrak joining forces with Heckyl to capture Dino Charge Aqua Ranger, Hayley Hale so Vrak can use her powers to destroy Crescent Bay. To stop Vrak and save her sister, Heather Merrill calls on her old Megaforce Ranger teammates to join forces with the Dino Charge rangers. However, when the megarangers are places under Vrak's control, Heather faces a tough decision in order to save her friends.