S12E13 - White Thunder (3)
Synopsis
The Evil White Ranger steals the DinoThunder gang's Stegazord, and combines it with his Dragozord, into his own Megazord, the Dino Stegazord. While Mesogog sends out a souped-up version of Angor to complicate matters, White Ranger faces Red Ranger one-on-one, leading to the unlocking of a new Dino Power source in Conner. White Ranger rejects both the other Rangers, and Mesogog's side, destroying Angor to prove this point.
Eventually, Tommy discovers Trent turning into the White Ranger. Having modified the DT team's Fossil Finder, he encases Black Ranger in amber before he can alert the others to the discovery of the evil Ranger's identity. Meanwhile, Cassidy & Devin are still recovering from their last scheme to discover White Ranger's ID, and literally stumble into getting Trent demorphing on videotape.