MCU Cap finds out that Sharon and Bucky were killed by one of the X-Men. He decides to pay a personal visit to the X-Mansion to get some answers and asks his friend Tony to go with him to back him up against some of the more powerful X-Men.
This is the classic cast from Fox X-Men from the first 3 films (Hally Berry, Famke Jansen, Hugh Jackman, etc.) The roster includes Wolverine, Storm, Colossus, Jean Grey, Cyclops, Beast, Ice man, and Rogue. Am I forgetting anyone?
Professor X will be sitting this one out
Tony and Steve get 1 week to prep and have access to Shield files and intelligence as well as Shield tech.