Episode: "Towelie” (s5e8)
Original Air Date: August 8, 2001

In order to avoid having to explain what tampons are, Mrs. Marsh buys Stan the $399 gaming revolution, the 2001 Okama Gamesphere. Although it recurs throughout the series almost every season, only one game is ever seen: Thirst for Blood. Also an arcade game, Thirst for Blood is one part Primal Rage, one part Mortal Kombat, and three other parts Primal Rage II. Giant monsters fight for control of craggy, volcanic landscapes, just like in the Jurassic Era. It's a valuable history lesson and a great way to forget about menstruation.