The Tronsplitter first appeared in the episode "Negaduck". Megavolt first used it to rob a vault, but was disappointed to find ball bearings in the bags. Darkwing emerged from one of the bags. Megavolt tried to escape from the window, forgetting he was on the 90th floor. Megavolt used his ray gun to create a wrecking ball from the ball bearings. But Darkwing dodged the ball, and it hit Megavolt instead, knocking him out of the window. As Megavolt plummeted towards the ground, the Tronsplitter zapped Darkwing, causing him to split into the titular villain (not to be confused with the evil Darkwing from the Negaverse) and Posiduck.
To be added...