YAM II Return of the Killer Potato - Version 2.2.6 YAM returns on the screen with YAM II. YAM II : Return of the Killer Potato takes place a short time after the end of the previous installment, Yam the Killer Potato. With the apparent defeat of the enemy leader, Galdov, the Potatos have regained their confidence in winning the war and have uncovered a secret hidden on their own homeworld! Four Crystals known as the Fire, Time, Space and Reality Crystals were being hunted by the alien invaders. However thanks to the bravery of a Potato called Yam the Crystals were kept out of enemy hands. Yam now leads the Potatos in a mission to take back their homeworld from the aliens invaders who are still present and put an end to the war once and for all. With his knowledge of combat, Yam intends to lead the Potatos across their homeworld in a series of strategic strikes on enemy strong holds, supply lines and bases.