|This article is about a/an ally in Mighty Morphin Power Rangers.|
- "Ectophase Activate!"
- ―Dex's transformation call.[src]
Dex Stewart is a prince of the planet Edenoi, homeworld of Alpha 5, and the current Masked Rider: the guardians of Edenoi. As with all his race, he possesses a gem in his forehead that channels various powers, including broadcasting his memories into thin air. Dex's grandfather, King Lexian, gives Dex the Masked Rider powers when the planet was attacked by Count Dregon, a tyrant who was aware of Edenoi's lack of weapons and armies. While the planet fell, Dex continued to lead the resistance against Dregon's tyranny. He encounters the Mighty Morphin Power Rangers during a battle where he initially thinks that they are working for Dregon. After a brief fight, the heroes team up to take down the tyrant's Plague Patrol and Cogwarts. The Rangers depart as new friends to combat the Repellator but it is now clear that Dregon is turning his sights towards Earth and Dex needs to travel there to stop him.
Dex disguises himself on Earth as a human called Dex Stewart, meeting new friends on the new planet as he battles Dregon.
- Rider Kick: A powerful jump kick strong enough to destroy a Cogwart with one hit.
- Electro-Saber: A large sword drawn from Dex's belt that acted as his personal weapon.
Appearances: MMPR S3 Episodes 1-3
- Mighty Morphin Power Rangers (Season 3)