Some time ago, Tyzonn was on a team of Intergalactic Emergency Responders, from Mercury.  It was their job to help save lives during emergencies.  However, during one incident, Tyzonn made a mistake and lost the members of his team.  This was at the hands of the Fear Cats.  After the lose of his fellow teammates, Tyzonn set off to hunt down the Fear Cats and destroy them.

Among those that were thought to have been lost in the cave in, was Tyzonn's girlfriend Vella.  Tyzonn & Vella were engaged to be married, but thanks to the the Fear Cat Crazar, that marriage never came.

When Tyzonn arrived on Earth he encountered Moltor, who demanded that he join his army.  When Tyzonn refused, Moltor attacked and transformed him into a reptilian monster, and became Moltor's prisoner.  The only way Moltor would change him back, was by Tyzonn to do Moltor's bidding.  

When Tyzonn was ordered to steal the Parchment from the Rangers, Mack saw more than just a monster attacking them.  After many tries, Mack finally managed to convince Tyzonn to let him and the others help him.  

With Tyzonn on their side, the Rangers got the Parchment back and found the Touru Diamond.  However, Tyzonn was still stuck in the reptilian form Moltor had transformed him into.  Tyzonn thought he was still stuck in his monstrous body, but Sentinel Knight appeared and told the Rangers that the two retrieved Jewels of the Corona, could grant such a miracle.  The two jewels magic returned Tyzonn to his human state.

Tyzonn then left the Rangers and returned to his quest, but their paths soon crossed again.  When the Fear Cats attacked and archeological  team in Brazil, the Rangers came to help, and soon met up with Tyzonn.  

During a battle with the Fear Cats, Tyzonn was badly wounded and turned into his Mercury Form.  It was by Mr. Hartford's technology that he and Ronny were able to save him.  Ronny then tried to convince Tyzonn that his place with with the Rangers, as part of the team.  

Tyzonn finally realized that by joining Operation Overdrive, he could protect and save many lives.  The young Mercurian is now the Mercury Ranger.  He uses his Drive Detector in battle as both a staff and and laser blaster.  Plus, he commands his own small fleet of Zords; the Rescue Runners.

After learning, during his battle with Crazar, that Vella is still alive, Tyzonn promised that after he helps the other Rangers defeat the remaining evil forces and reclaim the Crown and Jewels, he would find his lost fiancé.  

After the final battle with Flurious was won, the Crown & Jewels returned to Sentinel Knight, and Mack given new life as a real human, Tyzonn was ready to begin his search for Vella.  But the search didn't even get to start.  Norg showed up at the mansion, with Vella.  Thanks to Norg, Vella was saved from the Chillers.  Now Tyzonn & Vella together, they can return to their normal lives and be together from now on.