After years of peaceful existence on the distant planet Valorie, Questar and his people were forced into battle.
the power of their STEP crystal ripped a hole in the fabric of time,
sending them back through time and space to prehistoric Earth.
Unaware that at the same moment as their time jump, a tractor beam was attached from the Rulon's flagship, which caused it to make the jump with the Valorian ship.
The evil emperor Krulos now plots to capture the STEP crystal, with his own grotesque Rulon forces.
Each side uses their own methods for controlling/making friends with the Dino-Riders.