After heading home from the School of Friendship for spring break, Pharynx proposes to do an experiment to overcome a defect some changelings have, but no changeling wants to do it, so each changeling's name is written down on paper and placed in a hat, and Ocellus' name is chosen, she undergoes the experiment and her appearance and behavior begin to change.

Inspired by the 1963 Outer Limits episode The Architects of Fear and the 2003 Teen Titans episode The Beast Within.