She-Ra: Princess of Power (1985)

S1E51 My Friend, My Enemy

Hordak falls violently ill after Skeletor’s treachery, his body wracked with a mysterious poison. Despite their history of bitter conflict, She-Ra cannot stand by while her greatest foe suffers. She sets aside her sword and pride, venturing into the heart of danger to find an antidote. Along the way, she must confront her own doubts and the whispers of those who see Hordak as irredeemable. But as the poison spreads, she realizes saving him may require a sacrifice far greater than she ever imagined.