She-Ra: Princess of Power (1985)

S1E42 Enemy with My Face

Shadow Weaver conjures a creature from the murky depths of a swamp, a dark Melog born of shadow and spite. She unleashes it upon She-Ra, and the beast proves terrifyingly adaptive, absorbing the hero's very essence. It shifts and contorts, mirroring the Princess of Power's radiant form and wielding her own formidable abilities against her. Now, Adora faces a twisted reflection of herself, a dark echo of her own strength.