Voltron Force (2011)

S01E59 Evilseed

Eternia is under siege as peculiar, sentient plants begin to dominate the landscape. He-Man blames Skeletor for the chaos, while Skeletor points the finger back at He-Man. However, the true mastermind behind the invasion is a mysterious plant creature named Evilseed, who plans to conquer the planet with his green minions. To thwart Evilseed's scheme, He-Man and Skeletor find themselves forced to join forces, setting aside their rivalry in a desperate attempt to save Eternia from the botanical menace.