 Martin Lawrence returns as FBI agent Malcolm Turner, a master of disguise who again goes deep undercover as the sassy septuagenarian "Big Momma." The FBI has learned that a computer software developer named Tom Fuller has created a computer virus that allows access to classified US government files, Fuller is planning to sell the virus to terrorist organizations all over the world. Upon hearing this, the FBI s best lead is Fuller s wife. So Malcolm goes undercover again as Big Momma in order to pose as Mrs. Fuller s nanny. and as always, Big Momma once again turns the house upside down.