Clark Duke
as Marty
Evan Peters
as Todd
Lyndsy Fonseca
as Katie Deauxma
Michael Rispoli
as Big Joe
Garrett M. Brown
Xander Berkeley
as Det. Gigante
Omari Hardwick
as Sgt. Marcus Williams
Aaron Johnson
as Dave Lizewski/Kick-Ass
Garrett Brown
as Mr. Lizewski