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GrummelNet's Plasma Stalkers were a highly upgraded form of the popular Plasma Beasts line. The Stalkers unlike the Beasts had the ability of burrowing underground and travelling along with Ratchet, not to waste ammo (i.e. When Ratchet threw a Plasma Beast it lay on the ground until an enemy neared. The Stalkers; however, followed Ratchet so that they can attack enemies from a farther range.)