With the damage to Speedor's Engine Cast from the mysterious Engines intervening in the fight between Engine-Oh G9 and Drill Banki rendering him unable to enlarge to help in combination for a while, an agitated S?suke runs off after learning from Carrigator that they may be ancient Engines. However, S?suke runs into Drill Banki who is also in a bad mood and is reluctantly sent by Yogostein to find the ancient Engines as well. During their battle, the ancient Engines arrive on the scene in a hit-and-run as Go-on Red chases after them, finding them resting in an abandoned switchyard. While this occurred, the others set up a plan to lure the Ancient Engines out by having Seiku-Oh and GunBir-Oh spar until a vexed Drill Banki decides to take out his frustrations for Yogostein out on the two combinations, Bearrv, and Bus-on. Learning that his friends are in danger after seeing the Ancient Engines have no intent to trust humans, S?suke decides to fight on his own in a battle where he has no chance to win. However, Go-on Red's determination and Speedor's pleas for his ancestors to give humans a chance touched Kishamoth as he takes T-Line and K-Line to battle Drill Banki at Go-on Red's side, forming Kyoretsu-Oh to scrap the Savage Machine Beast as Yogostein finally realizes the Engines are not the Horonderthal. Soon after the fight, the ancient Engines become S?suke's secondary partners.