|“|| Grogar: "Where one is weak, another is strong, and thus unified, they are a formidable force! But we shall use their own strategy to defeat them!"|
Queen Chrysalis: "What are you suggesting?"
Grogar: "I suggest nothing. I demand that you join me, and together, Equestria will be ours!"
|~ Grogar assembling his team.|
The Legion of Doom is the unofficial name for a team who serve as the primary antagonists of Season 9 of My Little Pony: Friendship is Magic, the final season of the show. The team is made of the few villains of the show who remain unreformed, and are led by a new villain called Grogar.
A powerful, mysterious being pulls Cozy Glow and Tirek from Tartarus, snatches Queen Chrysalis from her hiding place, and resurrects King Sombra. This being is Grogar, a ram necromancer who had ruled ancient Equestria with his Bewitching Bell and an army of monsters thousands of years ago, until he was defeated by a pony named Gusty the Great and her Unicorn Warriors.
With his powers restored, Grogar has returned looking to conquer Equestria once more. Realizing that the Mane Six always win due to working together as a team, he decides to form a team of his own, promising the other villains that they will rule Equestria at his side. However, King Sombra rejects the offer and goes off to take over Equestria on his own.
When King Sombra is killed by the Rainbow of Harmony, Grogar chooses not to resurrect him again, using him as an example of what happens to those who defy him (with the implication that he will kill the other three if they don't submit to his authority). Tirek, Chrysalis and Cozy Glow fearfully comply.
The other villains argue about what the best way of being a villain is until Grogar sends them on a mission to retrieve his bell. The three villains try to get to the bell but to no avail. They bond over their shared hatred of Twilight Sparkle, the three villains work together to retrieve the bell and prove successful.
Returning to Grogar, the three trick him into thinking the bell isn't where he said it was. Grogar is angry, but nonetheless is glad that the three worked together. Unknown to him, Chrysalis, Tirek, and Cozy Glow, who are now friends, plan to use the bell to defeat him and Twilight and take over Equestria for themselves.
Friendship is Magic