Mike has a tricky time collecting a baby gibbon from France. Meanwhile, at Monkey World, the chimps have fun with fabric, and squirrel monkey Fidget settles into his new home.
There is a scuffle between the female capuchins, Tia needs surgery, and orang-utan Amy is heavily pregnant - and very grumpy. Meanwhile, there is something new in the play area of the chimp nursery, and Alison has her last visit with Paulo.
Baby woolly monkey Paulo is tempted outside by some delicious bugs, while onions are used to encourage natural behaviour amongst the capuchins. The team also has a radical plan for the third meeting between youngster Ben and alpha male Hananya.
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.
As Zoey the golden-cheeked gibbon goes into labour, the various gibbons in the park seem to know that one of their number is giving birth and have a morning sing-off.
A baby chimp tries to prove he is grown up enough to go it alone. The Bachelor Boys' reputation, meanwhile, takes a hit when they become frightened of a new toy.
A big decision must be made when alpha male Hananya continues to exhibit violent behaviour. Chimps Simon and Eveline, meanwhile, compete in a swing-off and there is some dental surgery to be done.
Resident capuchin TJ joins the new Chile arrivals, but he seems to be in a mischievous mood, and Alpha male chimp Paddy has to step in and keep his unruly troop in line. Elsewhere, orangutan Amy is pregnant.
Hananya shows that he is not so tough when it comes to needles, while four-month-old woolly monkey Paulo is being hand-reared by Mike and Alison. Elsewhere, the other chimps enjoy a `banana-fishing' expedition.
The team are forced to step in when the chimp introduction goes wrong and Ben is injured by the alpha male, orang-utan Hsiao-Quai struggles with her ever-growing son Kai, and the park's staff prepare to welcome another baby orang-utan into the fold.
Wildlife vet John Lewis is given a run for his money when he tries to sedate two excitable chimps. Plus, the male capuchins get used to life together.
Eighty-eight capuchin monkeys rescued from a research laboratory in Chile wake up to their first morning at Monkey World. Rodders has a run-in with a sticky melon, and Seamus the chimp comes face to face with alpha male Butch.
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.