The Genius

When Loki has the Tesseract, S.H.I.E.L.D. needs the Avengers. They call Captain America, Iron Man, Black Widow, Hulk... and Sherlock. They need the help of somebody with a great mind, who can help to get information from Loki, the God of Mischief, or even the Tesseract. Even though Sherlock doesn't want to, he still joins the Avengers.

WARNING!!!!!! This is a crossover, so we may change some things so they fit the story. Also, this is a sort of comedy, so please don't take it too serious.
Don't read it if you don't want to get spoilers from the Avengers and/or Sherlock (BBC).
It's based for the Avengers during the first Avengers movie and for Sherlock it is after His Last Vow.