Zombie Death Squad is a fictional zombie video game on iCarly. Its first mention and appearance is in the episode iStill Psycho where Cassie gives the game to Spencer as a present.
T-Bo then walks in and insists that they all play Zombie Death Squad at the Benson Apartment. When they're playing it, they are shown holding a sword, an axe, and a chainsaw and swinging as if they were actually attacking, indicating that the game utilizes motion detection technology. Mrs. Benson catches them playing and kicks T-Bo out.
Freddie and Gibby played it in the opening scene of iGo One Direction.