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Whilst exploring deep space, a meteor strikes Cosima and Dad's ship! After crash-landing on the unexplored planet of Proxima, Cosima makes a new best friend called Big Lizard.

When a pack of pesky, migrating trilobites overrun the ship, Big Lizard has to use a hidden talent to lure them away. But one little trilobite, Rex, decides to stay.

Searching for a vital part of the ship that was lost during their crash-landing, Cosima and Big Lizard find Dunk stuck on a beach. They use science to save the day and make a new friend.

Dad drops an essential gizmo in a hard-to-reach place. Big Lizard takes them on an underwater adventure to meet Ammon, the tentacled solution to their problem!

Whilst searching for new discoveries, a rockfall traps Dad, Cosima and Big Lizard in a cave. Just when all is lost, Dad finally discovers a new species!

Twig steals Cosima's volleyball. A chase leads Big Lizard and Cosima to her den... and also to a happy discovery!

Cosima and Big Lizard's solar-powered hoverboards run out of battery at nightfall. Can glowbugs be the answer?

Volcanic smoke blocks the three Proximan suns, which causes Big Lizard to become worryingly cold. Cosima's on the case and comes up with a superhot solution!

Cosima, Big Lizard and Ammon are squabbling over Dad's precious explorer notebook when disaster strikes. Only by working together can they save it from being lost forever!

When a giant beetle steals D.O.R.I.S.'s brain, thinking it's a nut, Cosima and Big Lizard give chase through the forest. Big Lizard uses unique skills to rescue poor D.O.R.I.S.'s superbrain.

Cosima and Big Lizard have a camping sleepover with a friendly little crab. In the morning, their new friend is missing, but why?

Cosima is so excited to tell Big Lizard about her life on earth that she doesn't realise he has something exciting to say to her.

Cosima and Big Lizard investigate the cause of Dad's mysterious sleepwalking in an adventure that takes them around Proxima and right back home again.

Big Lizard accidentally deletes some of Dad's 'boring' Proximan audio recordings. Through a dramatic sound adventure, Cosima realises the recordings are not boring - they're cosmic!

A triple solar eclipse is about to happen! Cosima and Big Lizard race down the volcano and hitch a lift on a dragonfly so that they can get vital equipment to Dad in the nick of time.

Big Lizard has found an epic crystal, and Cosima is jealous. Their squabbling reaches its peak at the top of the volcano! Will they learn to share before it's too late?

A dragonfly steals a bee cocoon that Cosima had vowed to keep safe. Cosima and Big Lizard give chase, leading to a surprising solution with a vacuum cleaner and some sticky vines!

When Cosima wrongly accuses Big Lizard of eating Dad's birthday cake, he vanishes. Has he run away, or is he planning a special surprise to save the day?

Big Lizard is jealous of the vacuum cleaner and hides it from Dad and Cosima. Ammon decides it's her new best friend, whilst Cosima reassures Big Lizard that he will always be her BFF.

A strange find far away from the ship breaks D.O.R.I.S.’s satnav. Luckily, Big Lizard’s on hand to teach Cosima how to find her way around without technology.