Plasma grenades are fictous weapons used in the Halo Series. They are often called Stickies, or Plasmabombs. the main part of the plasma grenades existance is its sticking action. as soon as it hits another player, it sticks to the player and kills them, unless they have Overshields. With overshields, the player loses all their shields. The plasma grenade is featured in all Halo games.