Episode Title:
Bat in the Belfry.
Episode Description:
Donnie experiments with April's crystalline fragment of the mystical Sol Star (which she is becoming quite obsessed with, due to its mighty power further developing and rapidly advancing her innate psychic/extrasensory abilities to tremendously dangerous power-levels), but accidentally supercharges it with electricity that stirs sudden sentience and autonomy in the crystal fragment. It then uses this to bring four of the main characters from Mikey's favorite comic book to life.
