The Rat King using the Shockwave
The Shock Wave is a weapon used by the Rat King in the 1987-1996 animated TV series. It appears in the episode Wrath of the Rat King.[1] According to General Traag, it was Krang personal weapon, and the ability to use it proves that Krang is the supreme warlord of Dimension X.
When deprived of the Technodrome, Krang grew desperate enough to demand that Traag send it to him on Earth. However, gravitational disruptions caused it to land in the wrong place and be found by the police, forcing Krang to rely on the Rat King to help him recover the device. However, the Rat King took the Shock Wave for himself instead, and it was destroyed in the battle with the Turtles shortly after.