When the Main Character punches a nuke... INTO THE FRIGGIN' SUN.
When the Main Character finally transforms into the True Unlosing Ranger, complete with Important Haircut.
Whenthe MainCharacter shows the fruits of his training by single handedly pushing Darkdeath's self-destructing armor into the sun (a feat which, at first, required not just him, but also Pirohiko, Dangerama, Etranger, and Darkdeath), demonstrating why his final form, Unlosing Ranger Omega, is truly legendary.
Screw that, the main character's existence is one big awesome moment.