The Club Guards appear in the episode "Access Denied". They work for Ladonna, who orders them to kick anyone she finds contemptuous out of her club. Mordecai and Rigby managed to fend them off, only to end up getting kicked out in the end. They also seem to be tough bouncers.
Both guards are tall and wear black suits. The guard on the left has light blonde hair and the guard on the right is bald.