03x07 - Cat Orgy

Stan’s sister Shelly is babysitting Cartman and she invites her boyfriend Skyler over, who in turn invites his band. Cartman squares off against Shelly when he tries to prove that she has broken his mother’s rules, but the pair team up when Shelly looks to get revenge on her boyfriend. Meanwhile, Mr. Kitty is in heat and searching for a good time by inviting all the neighborhood cats back to the empty Cartman house for an orgy.