He-Man and the Masters of the Universe (1983)

S1E16 A Friend in Need

Inventor Zicran arrives at the Royal Palace to present a Transmutator machine to Man-At-Arms, bringing along his daughter Ileena, a friend of Teela's. Ileena struggles with her self-esteem, feeling inadequate next to Teela's prowess. Meanwhile, the sinister sorcerer Jarvan, who had previously been vanquished by He-Man and Man-At-Arms, escapes from prison and targets the Transmutator. Disguised as a sweet old woman, he preys on Ileena’s insecurities, offering her a 'magic potion' that promises to enhance her confidence. Unfortunately, the potion is laced with a harmful substance, leading to her addiction and reckless behavior. As she unknowingly follows Jarvan's orders, she helps him seize the Transmutator. Can the heroes save Ileena from her addiction before it leads to disaster?