The Quantasaurus Rex was created by Time Force around the year 3000. It is supposed to be the most Powerful of all Time Force's Zords. It was accidentally sent back in time several million years, in a time travel experiment. Once the Quantum Controller Box was found, Ransik sent the mutant Commandocon back in time to get the Quantasaurus. He succeeded in bringing the Zord to the year 2001, and placed a signal blocker on the Q-Rex's head. Commandocon controlled the Quantasaurus to wreak havoc on the city, until Eric was able to destroy the signal blocker with his Quantum Defender. Eric could then control the Q-Rex with his Quantum Morpher. The Quantasaurus can fire its Q-Rex Laser at foes, and Replenish Power. Although it can also transform into Megazord Mode, allowing it to perform other attacks. The Q-Rex Megazord can fire it's Quantum Missiles, and Quantum Thunder Fist. And to freeze the mutants down, the Quantasaurus Rex Megazord uses its Max Blizzard. The Q-Rex stays in the year 2001 for now, in a huge cave where it recharges and repairs itself.