After the avengers got a new member to their team, Issac (a failed hydra experiment by two bored scientists, he gained black cat ears and a reputation for being a cold killer. Btw he has black fluffy hair and brown hair, does.). After he proved himself very worthy winter time comes around, one day they all get an anonymous letter. It says,"dear Avengers, we have an ex-hydra experiment locked in our backroom and would like you guys to come and collect it. Sincerely anonymous." (one last thing, Issac rarely ever speaks.)