Pregnant woolly monkey Piquita looks fit to burst, capuchin Sean, over from Chile, is keen to prove that nobody can groom quite like he can, and life hangs in the balance for Blue the ruffed lemur.
Mad Max meets his new housemates, and chimps Ben and Pip are in shock after another meeting with Hananya. Over in the woolly monkey enclosure, Piquita is the centre of attention and, in Paddy's chimp group, Bart enjoys his first taste of honey.
Baby woolly monkey Paulo meets his new family for the first time, young chimpanzee Eddi has fun and games with baby brother Bart, pregnant orang-utan Amy gets to grips with a breast pump, and Mad Max the marmoset arrives at the park.
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.
Newly arrived squirrel monkey Kimbo has a heath check and also gets the snip, while orangutan youngster Kayan goes outside for the first time.
A challenging trip into the great outdoors awaits some of the lorises from the park, and two black-shanked douc monkeys have quite the adventure in store for them in Vietnam.
The park comes to the aid of two marmosets, leaving Alison shocked by the condition of the male, while Louisa reaches out the foot of friendship to male crush Matty the capuchin.
Alison attempts to rescue a squirrel monkey, who proves to be something of an escape artist, and the newly arrived orangutan youngster Kayan meets with Bulu Mata for the first time.
Alison visits Twycross Zoo to collect an orphaned orangutan in need of a new home, plus there is some startling news about a capuchin recently rescued from a life in the pet trade.
Woolly monkey Piquita requires an operation, new capuchin Louis gets a lovely perch, while the chimp team find themselves trying to navigate a double blow after two sad losses.
Alison finds herself on a mission to rescue a marmoset that is being kept in a hamster cage, and chimp Kangoo takes his time deciding whether to venture into the outdoor enclosure.
Orangutan Silvestre arrives in Switzerland to be the leader of a small group, and Alison decides the best option is to separate Sasha and Kangoo so they can have a chance at a fulfilled life.
Infighting in one of the capuchin groups leads to Louis having to undergo surgery while the cotton-top tamarin Mo loses their mate, Uncas, only to end up gaining a new friend.
The team at Dao Tien in Vietnam cares for a rescued douc monkey, two golden-cheeked gibbons take to the trees, and a slimmed-down loris enjoys success in its search for a mate.
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.
A video of a sick male marmoset results in an urgent rescue mission. It may be too late to save the male, but there's hope yet for a female at the same address.