Cammy was introduced in the fourth "" revision, "Super Street Fighter II: The New Challengers", as one of four new characters joining the previous games's roster. In this game, Cammy is a teen-aged agent of the fictional Delta Red commando task force within Britain's Secret Intelligence Service (MI6) formed to investigate and eradicate global crime syndicates. In the Japanese version of her ending, she is revealed to have been an agent working for the villain M. Bison in the past, but lost her memories during a past operation. The American version instead reported her as a previous lover of M. Bison's, but equally suffering from amnesia. Other members of Delta Red include Commander Watson, Colonel Wolfman, Lt. Col. Hannah Ackerson (a relatively new addition), 1st Lieutenant Lita Luwanda (who treats Cammy as a little sister), Matthew McCoy, and George Ginzu.