Spike has grown up into a respectable drake: kind, smart and devoted to his job of protecting the Princess of Magic. However when Twilight is badly hurt while he is away, he is visited by a pony who gives him the clue to who got Twilight hospitalized.

Spike is ready to make them regret it; the rage is pounding, and it's going to hurt who dared to spite him.

It does run in the family, doesn't it?