|~ Main Drain's final words before his death|
Main Drain is an energy draining robot monster used by the Machine Empire. He first appears in the episode "Inner Spirit" of Power Rangers Zeo.
He was voiced by Brad Orchard.
This monster was first enlarge by Clank and Orbus, the Rangers summoned the Zeo Megazord to battle Main Drain. In battle, the Yellow Ranger used the Zeo Battle Helmat 2 on the monster, but it had no effect, the Zeo Megazord and switch to its battle mode to equipped its Zeo Saber, it had managed to finally get a few attacks in as Main Drain grew visibly frustrated.
Rather than try to hit them with an energy blast to regain control of the battle as would be expected, the Machine Empire "begged" the Rangers to stop, as does the monster, but it was a trick as Main Drain shot his drain tubes underground and attached them to the Zeo Megazord, draining the Zeo Megazord out of its energy, allowing Main Drain to fire his lighting beams at the Zeo Megazord.
Alpha was able to transport the Zeo Megazord out of the area, Main Drain later returned and attack the Red Ranger inside the Red Battlezord who got buried under an avalanche, but he later gets blasted by the Yellow, Green, Blue and Pink Rangers, he then grabs them and throws them out of the scene and blasted them with his Lighting Beams, the Red Ranger manages to regain his control over the Red Battlezord and fights Main Drain, but he lost control, for which Main Drain attacked it with his cords, but thanks to advice he remembered from Sam Trueheart, he was able to break free from Main Drain's cords and regain control of the Red Batllezord and turn the tide, after a long and heated battle, the Red Ranger was able to destroy Main Drain with the Red Battlezord.
Main Drain was seen as an audience member in Prince Gasket's Machine Arena.
Main Drain was cocky and overall arrogant, but he does show a lot of loyalty to the Machine Empire.