Cosima loves nothing more than hanging out with her best buddy, Big Lizard, but life on Proxima isn’t all plain-sailing – this is a wild world, a gigantic one, which would test the character of even the best space explorer.

Based on the real exoplanet, Proxima B, Cosima and Big Lizard adventure around a world full of fascinating pre-dinosaur creatures such as ammonites and trilobites, exploring caves, volcanoes, swamps, deserts, and an underwater environment teeming with life. They meet Ammon, the handy ammonite, Twig the giant millipede, Rex the energetic trilobite, and Dunk the ever-reliable dunkleosteus.

Whilst Dad tends to their broken ship, and glitching computer, Cosima helps Big Lizard solve problems for their friends using the perfect blend of human ingenuity and natural knowhow – always making it back home in time for tea!