Zeltrax

"He gave me life. Life you stole from me. And now you will repay it with your own!"

- Zeltrax revealing his hatred of Tommy Oliver

Zeltrax, previously known as Terrance "Smitty" Smith, was one of Mesogog's henchmen.

Early Life
Terrance "Smitty" Smith was once a partner of Tommy Oliver and Anton Mercer. At some point, Tommy and Smitty were up for the same job, and Mercer chose Tommy over Smitty. Smitty went to work for a different company, where, during an explosion at his lab, he was grievously injured. Mesogog found his ruined body and rebuilt him with cybernetic technology into a black armored cyborg.

As Zeltrax
As Zeltrax, he is bent only on gaining revenge on Tommy and holds him responsible for the recent tragic events in his life, including his near fatal accident. During his attempts at revenge, he inadvertently created a clone "son" named Goldenrod. Goldenrod proved a powerful adversary to the Rangers, but was destroyed by Tommy, increasing Zeltrax's hatred of the Black Ranger. After a second near fatal experience, because of his master's plans, Zeltrax mutinied against Mesogog and went out on his own. Zeltrax later gained a super powered form through the special underground spring that flowed beneath the Tree of Life. In the final episode of Dino Thunder, Zeltrax kidnaps Elsa (who was reverted to a normal human being after her powers were sacrificed by Mesogog to power his trans-mutation cannon) and invades the Rangers' base. Then, with the aid of the Triptoids, Zeltrax built his giant Zelzord, where Elsa is held hostage. Zeltrax uses his Zelzord to demolish Reefside, but Tommy battles Zeltrax along with Kira who rescues Elsa just in time before the Zelzord is finally obliterated by the self-destruct of the Rangers' Dinozords. Elsa is saved, and Zeltrax was eventually destroyed by Tommy and Kira.

SPD Encounter
Zeltrax also appeared in the Dino Thunder/SPD team up episode, Wormhole, which is set before the Dino Rangers' final battles. During the episode, Zeltrax reluctantly joined forces with Emperor Gruumm who had traveled back in time through a temporal wormhole. Together they fought the Dino Rangers and the S.P.D. Rangers. Despite Gruumm's aid, Zeltrax was defeated by a double-team from Tommy and Anubis Cruger, the SPD Shadow Ranger. Zeltrax then retreated and left the Tyrannodrones he had to their doom.