Captain Planet and the Planeteers (1990)

S4E5 The Unbearable Blightness of Being

Dr. Blight activates her most cunning invention, allowing her to transfer her consciousness into Gaia's body and seize control of the planet. As Gaia, now trapped in Blight's form, struggles to rally the Planeteers for help, the imposter wreaks chaos across the Earth. The real Gaia must find a way to persuade her friends to assist her in reclaiming her body and halting the widespread devastation caused by the villainous Blight.