He is a student at Medfield College who goes a series of acquiring various superpowers through bizarre, unlikely means. Every year, he has to help save the college from bankruptcy, through various means of scientific inventions or discoveries.
One night, he gets struck by lightning while installing a replacement computer part and becomes a human-computer able to absorb vast amounts of information and make incredibly fast calculations.
Dexter is working on a formula for invisibility, but can't crack it, until a lightning storm strikes the chemicals, creating a working invisibility serum.
Dexter experiments with a serum to increase the size of a scrawny cow that mixes with a super vitamin experiment of Richard Schuyler's. This ends up resulting in the cow becoming a super milk producer and Dexter gaining super-strength after putting that milk in his cereal.
Following the same plot as the original, with updated modern technological references, the film is a remake starring Kirk Cameron as Dexter Riley.
Dexter is first mentioned in the Epcot attraction when during the queue line, his name is called out by a secretary informing him he's left his tennis shoes in the computer lab. The riders later pass by the computer lab where his name is on a plaque outside, as well as his Medfield letterman jacket and tennis shoes being visible.
- Dexter is one of the first live-action Disney character to appear in more than one live-action Disney film even before the 1980s.