He-Man and the Masters of the Universe (1983)

S1E28 Valley of Power

Adam, Teela, and Cringer venture into the Valley of Power, a place known for its enchanted waters that grant immense strength to those who drink from them. Meanwhile, a mysterious figure named Danavas has also arrived, having taken the egg of a Mother Rogue. When the egg hatches, he forces the baby bird to consume the magical water, hoping to harness its newfound power for his own ends. As the bird rapidly grows to a colossal size, it poses a significant threat to the Royal Palace, becoming a dangerous pet under Danavas' control.