Calamity is a criminal organization that is operating in the 1960's. They had pulled off several successful heists. The leaders of Calamity are Big Bad Daddy and Big Bad Mama. Before his death in 1967, Calamity's safecracker was Forrest.
While Cate Archer was infiltrating H.A.R.M.'s secret Rocket base on an island off the coast of Mandaru, she overheard two Scientists talking about Calamity. Calamity was planning a follow up to their famous Paris caper, which shocked the two scientists. Big Bad Mama is of the opinion to move forward trying new things instead of re-hashing past success.