Bowser Junior whistled as he continued riding, until he was sent spiraling into the air, off his Mach Bike as one of the Chain Chomps surfaced. Bowser Jr. went plummeting down towards the mouth of a Chain Chomp, screaming as the Chain Chomp readied his mouth, when Petey Piranha swooped in and snatched Bowser Jr., flying away. The Chain Chomps were pissed as Bowser Jr. climbed on Petey's back, patting the humanoid Piranha Plant on the head as Petey laughed, both of them crashing into a large wall. Bowser Jr. and Petey both fell, landing on one of the roofs of a train car, that went through the tunnel inside. There were five train cars, with Junior and Petey on the green one.
Bowser Jr. and Petey Piranha both looked at each other oddly as the passengers inside were actually Primids and Eggplantmen, all of them taking out their guns, Superscopes, and eggplants as they fired their shots and chucked the fruits at the two. Bowser Jr. and Petey ran towards the back of the train, jumping from the red car to the purple car, where they saw the Chain Chomps munching through the tunnel walls, chasing after the train as they wanted to tear Bowser Jr. apart. Glancing at each other, Bowser Jr. and Petey nodded as they broke through the roof, beating up the Primids and Eggplantmen with punches, kicks, and headbutts. Petey slammed his chest several times as he bellowed loudly, causing the remaining humanoid foes to fall on their backs, with Bowser Jr. slashing the door into pieces. Thar be stuff goin'.