"Back on CYBERTRON, even before the war, SCORPONOK lurked in the dark, unpopulated places of his world, waiting for unsuspecting travelers to pass by. He would burrow silently through the shifting powdered iron of the planet's southern deserts, stalking his prey. The robots he hunted never even suspected his presence until he burst from the ground in a shower of glittering, steel sand."
Thanks, I've added that. Do you know if I have got the tech spec numbers correct, I only had the tiniest image to go by: Scorponok (Stalker) - ROTF Main Line - Transformers Resources