Former Veteran Power Ranger Tommy Oliver takes a teaching job at the city of Reefside years after escaping from an ordeal with the evil and mysterious reptilian monster Mesogog, and is assigned to look after three detention students: Conner McKnight (soccer star), Ethan James (hi-tech prankster) and Kira Ford (singer). During a trip to the museum, the trio stumbles upon a secret hideaway and find the magical Dino Gems. Kira rejects her Gem soon after, only to be abducted by Mesogog's forces.