This story is a sequel/spinoff to https://www.fimfiction.net/story/282716/comet-the-colt-of-steel
Many years have passed since a spaceship landed at Sweet Apple Acres. Comet now leads a team of heroes known as the Justice Stable of Equestria and is seen by other heroes as somepony to aspire to. Except for his 'older cousin' Tara-Zar-El who just sees him as a big blue dork who goes around spouting nonsense about friendship.
An epilogue story set fifteen years after The Ending of the End