Tommy Oliver

Oliver experimented with Anton Mercer to create creatures from dinosaur DNA. Dr. Mercer disappeared and a evil creature named Mesogog showed up, but it turned out that Mercer was transformed to become Mesogog. He captured and used Tommy's experiments for his evil purposes. Tommy escaped from Mesogog and didn't see him for years after.

He and Andros, the Red Space Ranger, summoned eight other Red Rangers to help defeat the Machine Empire.

A few years later, Tommy became a high school science teacher of paleontology. Tommy had already constructed a secret base and had prepared for the day Mesogog would return. When Mesogog did return, he recruited three of his high school students to become Power Rangers. Tommy became a role model for these kids.

Mesogog captured Tommy in hopes that he could help him open a new power source he had found. Luckily the DT rangers (now knowing their mentor's true history as a Power Ranger) were able to save him. Oliver opened the new power source and received the Black Dino Gem. This gave him the power of invisibility and much more. Using a morpher made by a Ranger Tech Expert, Hayley, Oliver was able to morph into the Black Dino Ranger.

Early on Oliver got into a rivalry with Zeltrax. At first Oliver didn't know why Zeltrax was so angry at him. Much time later, he found out that Zeltrax was his old rival Terrence Smith.

Tommy operated the Brachio Zord (a Carrierzord that can carry all the other zords).

Oliver helped the Rangers find many Dino Eggs, given them additional zords and weaponery.

He was spied on by Principal Randall who was actually Elsa.

When Oliver discovered Trent was the White Ranger, the evil Ranger was quick to freeze him in amber. The Rangers were able to free him but now Tommy was stuck in his morphed form. He was still able to assist the other DT ranger in the fight (until his demorphing problems were solved). Oliver quickly accepted Trent into the team when he became good again. He used his new charge to help unearth the Triassic Shield.

Dr. Oliver was forced to finally destroy his old friend Smitty in a climactic battle.

Oliver used strange goo in an attempt to demorph. The goo made him invisible instead. Later Oliver tried using his Dino Gem to restore himself to normal. This restored him to normal (visible and demorphed) but left him in coma. In the coma, Tommy fought three of his past Ranger forms (Green, White, and Zeo Red). Once Tommy was victorious, he awoke form his coma and helped the Rangers against Mesogog's latest monster. He also achieved his Super Dino Mode for the first time. Tommy was now able to resume his duties as a teacher at Reefside High.

Oliver was shocked to see Zeltrax return. He decided that he'd better search for him before anything bad happened.

Tommy often piloted the Mezodon Megazord when Conner was busy in another megazord.

Oliver was shocked to learn that Randall was actually Elsa in disguise. He was also shocked to learn that Mesogog was Mercer's alter ego. What shocked him the most was that Trent knew about Mercer's true idenity the whole time. After listening to Trent and seeing him in battle, Oliver was able to forgive the young Ranger.

Oliver discovered Elsa being an innocent civilian that was bended to Mesogog's will. Oliver introduced the team to the new Dino Assault Vehicle. He led the team on an assault on Mesogog's Island. The team stopped Mesogog's plan to turn humans into Mutant Dinosuars. Oliver fought Zeltrax in his new ZelZord. After the zord was destroyed, Oliver and Kira finished Zeltrax for good. In the final battle against Mesogog, Oliver surrenderd all his gem's power to defeat the evil creature.

Oliver enjoyed the prom and was happy to continue teaching at Reefside for the time being.