In Newtown Zoo they're planning the yearly Spring Festival, where they always collect donations for the zoo. But unhappily the Mayor has also planned a festival on the same day to collect money for his new town hall. He closes the zoo at short notice because he wants the citizens of Newtown to come to him. Benjamin and his friends refuse to have their festival banned. Then Benjamin has an idea: "We'll all celebrate together on the town hall square!" But that's where the problems begin.

Gogo Gorilla has hurt his hand while playing. Unfortunately the vet Dr. Zoolittle is away. So Benjamin treats poor Gogo. He does it so well that the Zoo director makes him the new veterinarian. When the zoo gets a new inhabitant - Dusty the African Desert Fox - Benjamin should vaccinate him against the "African Hickhop": an infectious illness that makes you hiccup and hop. But Benjamin didn't listen to what the Zoo Director said and next day the whole zoo is hicking and hopping.

The Newtown weather cock is in desperate need of repair. When Benjamin finds this out, he immediately stands in as the weather elephant. The fire brigade builds him a platform on the town hall tower and Otto supplies his friend with food and drink. At last Carla Caramba gets proper weather reports for her newspaper. Everything would be just fine, but then the two crooks Hinky and Pinky steal the freshly gilded weather cock and a heavy storm is coming towards Newtown.

Benjamin and Otto visit the forest ranger's house and discover that the mayor plans to build a road straight through the beautiful forest. The forest animals are to be shut up in cages in the zoo. Mr. Woodman, the forest ranger can't do anything against it because he's lying in bed with a fever. Benjamin becomes his stand-in and immediately has a lot to do. He has to look for a lost bambi, catch a poacher and also get the road build around the forest, with the help of the animals.

It's the Zoo Director's birthday and Mr. Pickler, the Mayor's secretary presents him with Chico the tassel-eared monkey from his boss. Because Chico doesn't get on with the other monkeys, he is put into the cockatoos' cage. But then Chico has suddenly disappeared. Benjamin and Otto set off to look for him. They find him with Anna and John, two children who have made friends with him in the zoo. Is Chico really a little runaway or have the children secretly taken him out of the zoo?

Kashmir the little ghost at Concord Castle can't float or go through walls any more. Now he plans to visit his uncle in Scotland to get his advice and help. The ghostly guided tours will now have to stop. Benjamin wants to stand in for Kashmir but the castle keeper doesn't like the idea. But when Benjamin's friend Otto explains that big ghosts can give you a big fright, then he agrees. And so a funny spooky adventure begins at the castle.