Zeltrax is fictional character from Power Rangers Dino Thunder. He was Terrence "Smitty" Smith when he partner up with Tommy Oliver and Anton Mercer until the explosion of the lab and he was brutally damage. He became a cyborg when Mesogog found him.
He once serve Mesogog, but now he's s a member of the Dark Kingdom.
He reappeared in Dragon Halfa with Rito Revolto, Hunter J and Malachite discussing on the search for the Chaos Emeralds and the Dragonballs. He realeased Shendu from his prison in Section 13 as a way to distract the Ultimate Defenders from interfering the Dark Kingdom's plans. But after seeing that Shendu was defeated, he along with the Tyrannodrones and Triptoids, while the Tyrannodrones and Triptoids fought the Terrence's teams and the other members of Ultimate Defender he fought Ethan and Terrence, but was defeated by the Half Saiyan and Dragon Halfa and he was force to retreat before giving him and his friends a warning then teleports to escape.