Lord Tirek, simply known as Tirek, is one of the main antagonists of My Little Pony: Friendship is Magic. He appears as the main antagonist in Season 4's finale "Twilight's Kingdom".
He is a power-hungry centaur with the power to drain the magic and abilities out of other creatures, particularly ponies. In Season 4, he escaped from his imprisonment at Tartarus to steal magic and gain power to take over Equestria, before he was defeated and banished back to Tartarus by the Mane Six, powered by Rainbow Power.
In the Legacy of Chris Thorndyke,
And he is reprised by Mark Acheson in the English dub and he will be voiced by Norio Wakamoto in the Japanese dub.