Slapshot is one of many power-enhancing Mini-Cons scattered across the Earth. A member of the Red Mini-Con Team, when Powerlinxed to a larger Transformer, Slapshot fires grenades that ricochet wildly against walls, floors and obstacles, but will explode upon direct contact with enemies. (Presumably they have some sort of sensor attached.)
Transformers Playstation 2 Game
Slapshot's Mini-Con storage panel was discovered in Antarctica, near the ruins of a recently-downed airplane. Following the defeat of Megatron, he and the other Mini-Cons returned to Cybertron and helped form the Matrix Cannon, Nemesis Shield and Vanguard Booster, giving the Autobots the power needed to destroy Unicron.