After weeks of battling a mysterious head infection, Erik joins the group two students; at forest school, the group three students enjoy a poolside classroom where Valentino proves he's more than just a class clown.

Three-year-old Wine ditches lessons to make a remarkable new friend, as she bonds with a young macaque; two refugees from a Thai circus, young mother Sampit and her son Sawadee, get a second chance at living semi-wild on a pre- release island.

Beni and Lala are increasingly restless in the infirmary, but they have a few more weeks of recovery before returning to class.

Beni and Lala are confined to the clinic following an accident; bullied Kesi causes concern for the team; Clara and her daughter, Clarita, are chosen for release back into the wild.

Recent nursery graduates Jelapat, Talaken, Bawan and Rona join their classmates at their new classroom; Dilla unexpectedly gives birth at midnight, but the delivery does not go smoothly.

Big changes are afoot for some of the pupils at Orangutan Jungle School, where orphaned orangutans learn the forest skills they need to survive in the wild; four new arrivals join the nursery classes and some familiar faces move up a grade.

Tense efforts to reunite traumatized Dilla with her newborn baby are met with mixed results, but the staff isn't giving up. Meanwhile, troubled Luthy is paired with a female orangutan to help with her behavioral issues. And on the Rungan River, a flash flood threatens the release schedule of female Clara and her baby Clarita. Not with them on this journey is Alba, a rare albino orangutan. Unlike Clara and Clarita, her condition means she may never be eligible for the stated mission of the jungle school: an eventual return to the wild.

A freak accident during birth causes young mother Dilla to reject her newborn baby, putting its life at risk. Meanwhile, the staff at Nyaru Menteng are hard at work identifying the orangutans with the most advanced forest and social skills to nominate as candidates for release. There's good news as two female orangutans who escaped from Palas Island are tracked down. Elsewhere, low water levels on Kaja have given the island's orangutans an unexpected treat: an artificial beach.

A flu epidemic has broken out at Nyaru Menteng. The prescription? Quarantined rest, lots of fluids, and...onion juice? Meanwhile on Palas Island, two female orangutans have broken through an electric fence. Back in class, coconut husking and tree climbing are on the curriculum, the latter with the help of some enticing fruit kebabs. Later, Beni is dismayed to discover he's back on a health kick, but his ability to dodge his diet shows his resourcefulness--a trait that will serve him well in the wild.

Several months have passed at Nyaru Menteng and big changes are afoot. Beni and Lala's broken bones have healed, meaning they may reunite with classmates. Another injured youngster, Alejandra, has lost an eye, but she is determined to overcome this new challenge. And on Bangamat Island, one-handed Kesi overcomes her fears. She's a great example for other orangutans who, if they maintain their progress, can be released back into the wild.