This was the season that saw the return of the character Tommy Oliver (reprised by Jason David Frank), to the Power Rangers franchise (Frank played the role from Mighty Morphin Power Rangers to Power Rangers Turbo); Oliver is now a Doctor of Paleontology in Reefside, California. When he is assigned three detention students, Conner (James Napier), Ethan (Kevin Duhaney), and Kira (Emma Lahana), who through misadventures in their detention end up finding the Dino Gems, paving the way for them to become the Dino Rangers.
Conner gains the power of the Tyrannozord, as well as super-speed; Ethan gains the power of the Tricerazord as well as the ability to make his skin invulnerable; and Kira gains the power of the Pterazord, as well as a sonic scream.
Tommy, or as the kids call him “Dr. O” once again becomes a Power Ranger by joining the team as the Black Dino Ranger with the power of invisibility, and they are also later joined by Trent (Jeffrey Parazzo) as the White Dino Ranger, with the power of camouflage. Trent must deal with the inner struggle of good and evil, as Tommy himself once had to do as the evil Green Ranger.