Dark Shadow is the villain of "My Little Pony: Friendship Is Magic". He is known as the Evil King of All Monsters and also the Mastermind of All Evil. He is the arch-nemesis of Twilight Sparkle and Princess Celestia. He lives in the Volcano of Doom from the Everfree Forest.
He is black silhouette-like monster with two horns on his head and two spike-like shoulders. He has a red diamond-shaped bindi on his forehead.
He is the ruthless ruler who plans to capture and steal the ponies' cutie marks for his world domination to conquer everything at his will. However, his plan was always foiled by Twilight and her friends. He has his idiotic henchmen, Grundo the Ogre and Snotty the Rat, who struggle with even simple tasks, and are highly gullible, easily being foiled no matter how bizarre, obvious, or pathetic their efforts are. Their constant failures for not capturing the ponies with their cutie marks result in these two regularly being abused, both verbally and physically, by Dark Shadow. He also sends out his associates (such as Queen Chrysalis, Squirk, Crunch the Rockdog, etc.) to take over Ponyville and Equestria for his world conquest, but they usually failed and defeated by the ponies.