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

S2E40 No Job Too Small

While on the planet Phantos, Evil-Lyn captures Teela, Man-At-Arms, and Orko, transporting them to Snake Mountain, where she employs a Reducto-Ray to shrink them. He-Man sets out to save his friends but discovers they are caught in a trap that threatens to either shrink him or end their lives if he relies solely on his strength. Understanding that he needs to think strategically, He-Man chooses to tackle the situation as Adam, especially since Teela has recently pointed out Adam’s supposed lack of intelligence.