The film begins with Badrol and Lim watching the news covering about the sudden disappearance of
durians in Badrol's home village, Kampung Durian Runtuh. A news reporter interviews Badrol's grandfather, Mr. Senin Bin Khamis, also known by the villagers as Tok Dalang, about the previous night when a durian fell but something managed to eat it and leave the durians shell clean. Tok Dalang and the locals dub the "something" a durian ghost since it’s unknown of who or what is eating the durians late at night. Badrol gets skeptical and decides to go to the village, taking Lim along with him. After riding on a bus which gets its tire punctured, the two are forced to walk to the village which is 5 km away. After a few complaints from Lim, a truck driver named Mr. Singh noticed the two and decided to give them a ride much to his friend and boss Pak Mail's chagrin. Badrol then tells them about their journey with Pak Mail talking about an abandoned house. At the village Upin and Ipin are playing in Uncle Muthu's outdoor restaurant while Sally is impatiently waiting for his pastries, Mak Uda, called Opah by Upin and Ipin's as she is their grandmother, arrives. Sally then nonchalantly spelling his name S-I-L-L-Y (Silly). The twins greet Opah who tells them to come home with their older sister Ros. Opah then asks Sally to see if he has finished making her clothing and ushers to fix it as Sally tells Opah that he couldn't finish sewing the clothes simply because the buttons keep popping out and is ruining his nails. After Sally complaints about Opah, Opah then asks Ah Tong, about the news of the durian ghost, but Ah Tong claims the durian ghost to be unreal, Opah claims Ah Tong that he 'never believes in anything'. Sally left as he lost his appetite. As Singh and Pak Mail drops Badrol and Lim on the shop the two then decided to ask Muthu for directions to Tok Dalang's house since Badrol hasn't been in the village for a while and he does not remember the way to his house but due to Muthu's unclear directions, he decided to ask Upin and Ipin to lead Badrol and Lim instead while Kak Ros drops by to deliver the pastries but decided to follow her brothers as she is forced by Uncle Muthu. Unbeknownst to the villagers, Salleh then meet Uncle Singh and Pak Mail at the abandoned house. Upon arriving at Tok Dalang's (called by Atok) house and having a reunion, Badrol and Lim took Atok's suggestions which is to explore the village, Badrol and Lim then have a motorcycle race, knocking out a child named Rajoo, who forces the two to replace his radio (when Rajoo sees the two heading towards him he jumped into the water with the radio) and his one-horned cow Sapy into the water. Badrol and Lim are telling him that they going home to Tok Dalang's house. At night, Tok Dalang talks about the Durian Ghost, after which Badrol and Lim sleep, with Lim wanting to go to the bathroom. The next day, they go to Tok Dalang's durian orchard with Rajoo's wagon, with an impromptu musical number ensuing. The kids, along with Badrol and Lim, then arrived at Tok Dalang´s orchard. After Upin, Ipin and Rajoo ride a leaf, they find a
fox-like creature named Oopet. Kak Ros, Badrol and Lim find them and at night, they go camping, which then Lim has to go to the bathroom again. They continued wandering through the woods, not knowing they already got lost when suddenly, a monster chased them and captured them both. The same monster then chases Ros, Upin, Ipin and Rajoo and Oopet. They go to a cave, where they get chased by a
snake monster and attacked by large
leeches. Tok Dalang, Opah, Muthu and Ah Tong then go to the orchard to find them. The children then found a plateu with fireflies, and Oopet tells them his story. It is then revealed to have been the one who ate the durians. Oopet then tells the children to find his mother. Suddenly, they heard a scream, it was then revealed as Badrol and Lim who got kidnapped by the monster (revealed to be Uncle Singh) to the cabin. Rajoo then sneaks to the cabin that Uncle Singh and Pak Mail, along with Salleh have some plans for haunting the orchard He threw a rock, which hits the large cage where a large animal is in. Through various tricks, they manage to save Badrol and Lim and escape the cabin. Oopet tries to help his mother but Pak Mail catches him and threw him against the cage. Fueled by rage, Opet´s Mother then destroys the cage and the cabin before attacking the hunters for wanting to kidnap her son. They escaped, but his mother is chasing them. As the hunters ran into the cave, the snake monster cornered them and they now stuck between the monster and Opet´s mother. The children catch up with them, and Oopet tells them to run while Oopet's mother is fighting the snake monster. Pak Mail and Singh then escaped through the portal during the conflict. Though gravely wounded, Opet´s mother managed to kill the snake monster and save the children. After which they tearfully say farewell to Oopet and his mother. Tok Dalang, Opah, and Muthu then found Upin, Ipin, Badrol, Lim and Rajoo, with them the accusing Salleh of following Mr. Singh's and Pak Mail's plans. Lim hands Rajoo his CD player and calls him, along with Upin, Ipin, Badrol and Kak Ros part of a "gang". In a mid-credits scene, Mail and Singh roaming in Oopet's world, they found a similar creature like Opet and plan to sell it again, only for them getting chased and attacked by its mother. == Cast ==