Darkwing Duck (1991)

S01E62 Jail Bird

Negaduck swipes a diamond that grants him the ability to absorb the powers of others. After he drains Bushroot, Megavolt, Liquidator, and Quackerjack of their abilities, the weakened villains must band together and rely on their vulnerabilities to take down the formidable Mega Negaduck, as he proudly dubs himself.