Main Drain was an energy draining robot monster used by the Machine Empire. In battle, he shot his drain tubes underground and attached them to the Zeo Megazord. He was the first monster to ever break a Megazord saber, which broke in two after Main Drain electrocuted the Zeo Megazord. He was destroyed by the Red Battlezord. Main Drain was seen as an audience member in Prince Gasket's Machine Arena.King for a Day