DC’s Stargirl season 3 episode 12, "The Last Will and Testament of Sylvester Pemberton," reveals that Sylvester is actually the Ultra-Humanite inhabiting a preserved body, leading to a brutal betrayal of Pat Dugan. This penultimate episode shifts the season's focus to a desperate fight against the Ultra-Humanite and Icicle, setting up the series finale. Read a detailed recap of the episode at TVLine . 'DC's Stargirl' Recap: Season 3, Episode 12 “Frenemies