Mercury Overdrive Ranger

A Mercurian alien, Tyzonn was a rescue worker, but during one mission, he lost his team in a cave-in caused by the Fear Cats. He tracked them to Earth but was forcibly turned into a monster by Moltor in the latter's mission to gain the Corona Aurora jewels. After, he met the Rangers, and after being turned back to normal by the Sentinel Knight, he joined Operation Overdrive as the Mercury Ranger.

Example of:
Sixth Ranger