Andy works at Safari World, the biggest and best safari park on the planet, home to animals from all over the globe. He works there with his boss, Mr Hammond and tech wizard Jen, who monitors all the animals from the Aqua Base.

Jen has been working on a new kelp forest for the Aqua Forest Dome, and Mr Hammond calls to find out if it is safe for him to go diving in there. Jen has been very careful to ensure there aren't any dangerous animals in there to hurt him, but when Mr Hammond asks about spiky urchins, Jen starts to look a little worried. She spots hundreds of urchins on the seabed in the new Aqua Dome – not only are they painful to stand on, but they are eating the all the kelp. It’s a disaster! Looking for inspiration in the wild to see how kelp forests deal with urchins, Andy heads out on an aquatic adventure.

Andy boards his safari-sub, a hi-tech underwater submersible capable of travelling to any location on the planet in the blink of an eye. When Andy arrives to the coast of California, he finds a group of male sea otters wrapping themselves up in the kelp so they don’t drift off. Andy would love to stay and watch, but he is on a mission to find out how to stop the urchins. Quite unexpectedly, he gets picked up by a fish called a garibaldi. Garibaldis are very house proud and will remove anything from their territory that doesn’t belong there, including Andy.

The Garibaldi accidentally drops Andy on an urchin spine and goes about moving the rest of the urchins from the nearby seabed. Just when Andy thinks he has his answer, he notices the sea urchins start returning. Is there something else that keeps the urchin numbers down? When Andy figures it out and the mission is accomplished, it’s time to head back to Safari World. Will Andy make it before Mr Hammond goes for his dive? Show less