To Change a Changeling

S7 E17: When Starlight Glimmer and Trixie visit Thorax at the changeling hive, they meet his brother, Pharynx, the only changeling still unwilling to share love and transform. Worried that Pharynx's bad attitude will undermine Thorax's leadership, they work to get him to accept the new way so that the hive will ultimately accept him.