A visit from the vet awaits one of the park's strangest residents, while the small monkey team lose the battle to save tragic marmoset Koba, who had been taken out of the pet trade.
Alison travels to Hampshire to rescue marmoset Clyde from a life in the pet trade, while the young orangutan Hujan gets to meet with older male Bulu in the nursery.
Elderly marmoset Jenny gets a visit from the vet before the arrival of a new life partner, while orangutan youngster Hujan begins to adjust to living life in the nursery.
It is moving day for young male orangutan Hujan, who is on his way to join the nursery group, while Alison tries to help rescued marmoset Koba build up some much-needed strength.
Rescued marmoset Koba clings to life after arriving at the park in a stricken state, and the lemurs at Malagasy find themselves dealing with a quite tricky tree-top challenge.
It is vet day for some of the primates, and Nelly the loris causes some concern during the checkup. Meanwhile, Sasha the chimp gets to know some of Bryan's group while Teo the gibbon tackles some hanging feeders.
There are plenty of comings and goings at the park as a marmoset family heads to a new home, Tya returns looking for love, and the Barn Woollies welcome baby Xenia to their tight-knit group.
Dr Alison Cronin and animal manager Jeremy return from a trip to Argentina with Sasha and Kangoo, two chimpanzees are given a new home at the park, and Tuan's orangutans receive a treat.
Alison and Jeremy prepare to fly Sasha and Kangoo from Argentina to Dorset, which means crating and loading them in the middle of the night.
Alison and Jeremy travel to Argentina to meet two chimps as they prepare to bring them back to Dorset. The team attempt to sort out the macaques' hierarchy problems.
Chimp Bryan has a trip to the dentist to remove a rotten molar, and Lee Butler returns to Vietnam to assess repairs needed at Monkey World's sister sanctuary.
The primate care staff move more than thirty capuchins in a day, the chimps react to a fallen tree and the guenons finally get to try out their revamped home.
Vet Nic Masters uses high tech diagnostic equipment to examine health issues in some of the park's smaller primates, including capuchin Louis and patas monkey Penelope.
There's big news for one of the chimp groups, and rescued marmoset Jangles summons up the courage to join her new mate Reggie in the outside enclosure.
Capuchin Matty needs a visit from the vet after fighting leader Erico for the top spot, and the birth of a baby woolly monkey is captured on camera.
As Alison collects a female marmoset whose owner has died, the squirrel monkeys try a new puzzle and Xingu's baby ventures outside for the first time.
Alison and the team welcome a new female loris to the park, and there's another tiny new addition at the woolly monkey house.
Alison takes action to protect the park after learning that COVID-19 can also affect apes. Chimp Gypsy's condition worsens and a little woolly bonds with his dad.
Alison and wildlife vet John Lewis are in Turkey to collect a young chimp previously stolen from the wild and kept as a pet.
A new baby woolly enters the world, while there's sadness over the passing of one of the park's most iconic characters.