The Mysterious Mare Do Well

The Mysterious Mare Do Well is the eighth episode of the second season of My Little Pony Friendship is Magic, and the thirty-fourth episode overall.

Summary
There is a new hero in Ponyville who is masked and stealing Rainbow Dash's thunder.

Verizon FiOS Summary
When Rainbow Dash discovers that a new masked avenger has been stealing her thunder as Ponyville's resident hero, so she attempts to reclaim her glory by doing various heroic acts, but she encounters many problems on her quest.

Trivia

 * "Mare Do Well" is a pun on the term "ne'er do well," a person who is completely lacking in merit.