A strange rock 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.

Big Lizard frustrates Dad by stealing a strange plant from the ship. A disaster is averted when Big Lizard persuades Dad that there's more to this plant than meets the eye - and nose...

When a meteorite splashes into the sea, Dad and Cosima cause problems by claiming it in the name of science, against the wishes of the sea creatures.