Dex may look like a handsome teenage boy, but he's really the Masked Rider - an alien superhero sent, along with his mischievous pet Ferbus, to protect the Earth from Count Dregon and his creatures of crime!
Nefaria sets into a motion a scheme to ruin Masked Rider's secret identity, by tricking Principal Chalmers into studying Dex's homelife, trying to determine what makes him such an exceptionial student. When his repeated testing fails to expose Dex, Dregon sends down Gork and Fleazoid to attack the city.
One tough student arrives at school, named Big Bubba! Now, Herbie and Dex must show the new kid around, while Count Dregon sends his own new kid to school. Can both bullies be stopped at once?
An explosion in Leawood Canyon leads Dex into a trap, where the Boulder Beetle monster begins to sap the Masked Rider powers out of him via negative proton rays. If that's not bad enough, Doubleface has a War Saber and a Reptosect monster waiting to finish him off, and Dex is missing Albee's recital!
