Charmed Avengers
Summary: Thanos has a new pawn and it's up to the Avengers to stop him, with the help of an unlikely trio. Welcome to San Francisco. Avengers/Charmed crossover
Notes: After the battle in New York, Loki informs the Avengers that he was working for someone else and that Thanos had another plan waiting in the wings: The Source of All Evil. Loki had overheard them talking about The Charmed Ones. So they pack up and head for San Francisco, where Natasha, who is really Prue in disguise, has 'found' some likely candidates for the Charmed Ones: the Halliwell sisters. Leo and Steve know each other from the war, and are very surprised to find each other in the twenty first century.