The Plasma Grenade is a large ball of fiery plasma that sticks to the first thing it hits when thrown, such as the walls, ceilings, floors, and other players.
The player can hold down the grenade button to charge up his/her throw and toss the grenade a fair distance.
A Plasma Grenade Is different than a normal Grenade in a lot of ways. First, the Plasma Grenade will stick to any person you throw it at. Second, when a bot is stuck with a Plasma Grenade, it will run away screaming; Almost identical to when you light a bot on fire with a flamethrower.
It also does not have a very large blast radius, and is not favored by many players.