Nick's Mother is the mother of Nick and only appeared in "Operation: M.I.S.S.I.O.N.".
History
In Operation: M.I.S.S.I.O.N., while Nick was reporting on the bowling match between the Villains (bowling team) and the Aussie Alley Masters, Nick's Mother appears and pulls on his ear while yelling at him about how she told him not to hang around "disgusting" bowling alleys.