Cosima and Dad crash-land on an unexplored planet, Proxima B. Cosima makes a new best friend, Big Lizard!

When a pack of trilobites lead by Rex overrun the ship Big Lizard uses a hidden talent to lure them away.

Out searching for a missing micro screw Cosima and Big Lizard find Dunk stranded on a beach and rush to help.

Big Lizard takes Cosima and Dad on an underwater adventure to meet the many tentacled Ammon.

Dad can't discover anything new on Proxima until a rockfall traps him with Cosima and Big Lizard in a cave.

Twig steals Cosima's volleyball. A chase leads Big Lizard and Cosima to her den, and 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 all three suns and Big Lizard becomes worryingly cold. Cosima needs a red-hot solution!

Dad shares his explorer notebook with Cosima and Big Lizard. They almost lose it but learn to work together.

When a giant creature steals D.O.R.I.S.'s brain, Cosima and Big Lizard give chase through the forest!

Cosima and Big Lizard camp-out with a little crab. In the morning their new friend is missing, but why?

Cosima's so excited to tell Big Lizard about her Earth-life she forgets he might also have something to say.

Cosima decides it's Christmas, but when Rex disrupts the festivities, Big Lizard creates a perfect 'Proximas'.

On an exciting trip round planet Proxima Cosima and Big Lizard record some cosmic nature sounds for Dad.

Cosima and Big Lizard race against time to retrieve sun googles so they can watch a cosmic triple eclipse!

Cosima is jealous of Big Lizard's beautiful crystal. Will they learn to share before it's too late?

When a giant dragonfly steals a bee's cocoon, Cosima and Big Lizard give chase with a vacuum cleaner!

Cosima accuses Big Lizard of eating Dad's birthday cake. He vanishes, but only to plan a special surprise!

Ammon decides a vacuum cleaner is her new best friend. Cosima reassures Big Lizard he is definitely her BFF.

D.O.R.I.S.'s sat nav breaks! Luckily, Big Lizard can teach Cosima how to find her way without technology.

Big Lizard takes Dad's special plant from the ship, which is just as well as it's about to explode!

When a meteorite lands in the sea Dad claims it for science, but the sea creatures have other ideas.

Dad needs some training to pass his astronaut fitness test. Cosima and Big Lizard put him through his paces!

Everyone gets stranded when the buggy gets a flat-tyre, but Big Lizard stumbles across a natural solution.