In another dimension of Earth, the RPM Red Ranger Scott uses the Skyrev Megazord to fight Venjix’s general Professor Cog in the deserts outside of Corinth. Cog tricks Scott into lowering his guard and then escapes the battle. In a subway within the Samurai Rangers dimension, Professor Cog and his group of Grinders enter the scene. In the city, the Rangers battle Sharkjaw and the Gold Ranger joins the fight but he was late. Professor Cog is surprised to learn that Rangers exist in this dimension too, but dismisses them as mere pests. Sharkjaw retreats after drying up and Octoroo tells him he is no longer needed as General Gut and his army of Moogers are waiting to attack in the human world. Professor Cog enters the Netherworld to meet Master Xandred. Professor Cog wants to use some of the Sanzu River to poison the humans in his dimension in return for the destruction of the Samurai Rangers. Master Xandred agrees to the plan. Back in the subway, the RPM Red Ranger makes his appearance. The Rangers are celebrating their victory with ice-cream when they run into a swarm of Grinders. Their swords prove ineffective against the Grinders until Red RPM Ranger joins the battle and destroys all the grinders. The Rangers bring him to the Shiba House so that he can explain his story. Scott doesn’t de-morph because he fears he might not be able to breathe as he is more accustomed to the atmosphere of a protective biosphere from his dimension. Later the Grinders make their attack on Antonio who morphs into action and fights the Grinders. The Gap Sensor alerts the Rangers to battle. Scott gets there early by taking Mentor Ji’s bike and helps out Antonio while the Rangers and Professor Cog enter the fray. Cog uses his hypno-bolts on Jayden and Scott (which will slowly cause them to distrust each other) and he uses his Portal attack to the other Rangers into his dimension. At the docks Cog blasts the Red Rangers into the water and leaves. Jayden tries to help Scott, who gives him the cold shoulder. Jayden is worried about his friends, but Scott tells him that the Rangers will help them. Back at the Sanzu River, the Grinders start collecting the Sanzu River. At the Shiba House, Jayden and RPM Red Ranger meet up with Mentor Ji who pinpoints the whereabouts of Cog, Sergeant Tread and General Gut. Jayden morphs into action and summons a horse while Scott takes the bike again. Both Rangers race to the scene. Scott is bitter that Jayden beat him to the scene and the two Rangers battle each other as Cog watches. After a brief fight the Rangers both appear unscathed much to Professor Cog’s confusion. Mentor Ji had noticed the effect of the hypno-bolts and reversed the poison with symbol power. The Rangers were staging the fight to fool Professor Cog. The Red Rangers work together to fight the villains, powering up to Shark Attack (Scott) and Super Modes (Jayden). During the fight the Rangers return to join the fight (courtesy of Dr. K and the RPM rangers) and defeat Professor Cog and Sergeant Tread. They then turn their attention to the Mooger army. The Rangers summon the war horses and head towards the Mooger army while the Gold Ranger and RPM Red Ranger use a car. The Rangers work together to trim down the army size. Red Ranger faces off against General Gut, who knocks him to the ground. As General Gut is about to finish him off Jayden uses the Shark Disc to defeat the swarm of Moogers and together the Rangers defeat General Gut who grows into his Megamode form. After a brief battle, General Gut reveals his True form which includes a Serpent like monster attached to his body. The Rangers form the Samurai Shark Megazord to finally defeat him. Antonio and Scott watch from afar until Scott asks Antonio to help him fix the damagecar unless they want to walk it back. Back at the Sanzu River, Master Xandred is furious with the failure as Octoroo tries to calm him down. Back at the subway, Scott says goodbye to his new friends before wishing Mike good luck with Emily.