Main article: Doraemon: Nobita and the Steel Troops § Plot\r
Nobita is in a bad mood after failing to get a large RC toy to upstage Suneo, who was showing off his own toy. Nobitas fit irritates Doraemon as he uses his Anywhere Door to get anyway from the summer heat cool off at the North Pole. Sometime later, Nobita follows and a discovers a strange bowling ball-like orb which starts blinking with a pulsating light, and summons what looks like a giant robot´s foot. After Nobita uses the foor to sled down, crashing into his room through the Anywhere Door, the bowling ball follows him home through the door and another robot piece falls into his backyard. A frozen Doraemon follows soon after, covered in ice before being thawed out and with a cold. Learning of the robot parts, Doraemon admits to Nobita that he has nothing to do with it as the two use the Opposite World Entrance Oil and the Roll-Up Fishing Hole to enter the World Inside the Mirror, an alternate mirror world without people. There, they built the robot which Nobita christens Zanda Claus as he believed the sphere summoning the parts is from Santa Claus.\r
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Using a brain wave controller that Doraemon pulls out of his pocket, Nobita has the robot perform gymnastic maneuvers before bringing Shizuka Minamoto to join the fun. However, Shizuka presses a button on the control panel that makes the robot fire a huge laser beam that destroys hall the city. The group realizes just how dangerous Zanda Claus really is, and they decide to return to the real world and forget about ever finding the robot. However, Nobita forgot about the sphere it has been senting telepathic messages to a mysterious girl named Lilulu. The actual owner of Zanda Claus, Lilulu seeks out Nobita as he accidentally lets slip that he knows about the robot. After Lilulu proceeds to force him into showing her where it is, Nobita borrows the Roll-Up Fishing Hole from the spare pocket Doraemon keeps in the closet to take her to the World Inside the Mirror. She reclaims Zanda Claus while getting Nobita to let her borrow the Roll-Up Fishing Hole for a while.\r
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After some time, Nobita is visibly nervous about what she is up to and, after seeing two shooting stars in a row, uses the Bamboo Copter to investigate the forest by Mt. Ura
