Batman, Nightwing, Red Hood, Red Robin, Robin, Batgirl, Batwing and Catwoman are transported to the Marvel universe. There the batfamily decides to take on the Avengers. Not wanting to be caught off-guard the batfamily decides to take a year of preparation and observation. During this year Batman, Nightwing and Red Robin join the Avengers. Can the batfamily subdue Earth's mightiest heroes.
Members of Avengers: All that sided with the avengers initially in the Avengers vs X-men event
State of Mind: Bloodlusted batfamily, IC Avengers
State of Mind: Everyone is Blood lusted
Edit: All of the batfamily's gear and materials including the Batcave and Wayne's wealth transferred over as well.
Edit 2: Pre-52 and New 52 feats can be applied