It's quiz time! The Orb tests Obki's knowledge against a penguin and a panda. But who will win?

Obki is struggling to understand what biodiversity is, so his friend the Orb explains using... tennis!

Obki's trousers rip and he decides to buy lots of new ones. But then realises there are other options.

Obki learns how to protect his favourite lettuce from a snail without using harmful pesticides.

Orb takes Obki to the toy swap box! It turns out what is old for you - is new and exciting for someone else!

A fishing net breaks free and attaches itself to Obki's underwater base. Obki is determined to sort it by himself, but will things go to plan?

Obki embarks on a grand design mission to make his refillable water bottle the best one ever.

Obki discovers the coral reef all around their base is ill. What can Obki do to save it?

Obki is introduced to the wonder that is fast-growing, carbon-capturing bamboo. This raw material can be used to make toothbrushes, clothes and more!

Obki loves to sing along in the shower, but it turns out shorter showers are much better for the planet. Challenge accepted!

Orb shows Obki how to make compost to fertilise the soil in a natural way, but Obki uses way too much and things grow out of control!

Obki learns that he must complete his missions urgently to ensure the heating of planet stays at a lower target.

Orb takes Obki back in time to the 80s to show him how humanity came together to successfully preserve the ozone layer.

Obki only wants to eat straight and beautifully orange carrots. But can he taste the difference between pretty and wonky veg?

Obki realises that he's losing heat from his underwater base and wasting energy.