Captain Planet and the Planeteers (1990)

S2E19 Losing Game

The Planeteers travel to Kwame's native Africa to look into some unusual issues with local cattle, brought to their attention by his close friend and mentor, Dr. Mabutu. Unbeknownst to them, Dr. Blight is plotting to persuade a tribal leader—who is also a friend of Mabutu's—to permit the use of a serum that transforms bulls into super steers, aiming to solve meat shortages. This plan poses a danger to the land due to overgrazing and leads to some uncomfortable side effects from the serum, which eventually fade. With the help of Captain Planet, the Planeteers work to eliminate Blight and his robotic companion, MAL, from the area.