She-Ra: Princess of Power (1985)

S01E56 Of Shadows and Skulls

Insulted by Hordak's dismissive treatment, Shadow Weaver quietly plots her own path to power over Etheria. She approaches Skeletor with a proposal for a secret alliance, offering her dark sorcery in exchange for his aid in seizing the throne. Skeletor, ever the opportunist, feigns agreement while secretly planning to discard her the moment she outlives her usefulness. As the two schemers circle each other, their fragile pact seems destined to crumble into betrayal.