Olga makes friends with Venables the toad. However, when Karen reveals her family are planning toad-in-the-hole for tea, Olga mounts a rescue mission to hide Venables and keep him safe! While Graham and Fangio make hiding places in the compost heap, Noel is encouraged to dig a deep hole in the vegetable patch. This results in the destruction of Mr Sawdust's beans! Its finally revealed that toad-in-the-hole is human language for sausages in batter. Olga is very relieved, and the Sawdust family sit down for beans in-the-hole!

Olga spots a new addition to the garden, but what or who could it be? It looks like the Sawdusts have another tortoise! Olga sends Graham to find out more about Bessy, and when he returns, Olga can see Graham is in love.

But when the true nature of Bessy is revealed, Olga doesn't know how to tell Graham that she's really a bike helmet.

Olga's elaborate tale of space-travelling tortoises helps Graham come to terms with Bessy's mysterious disappearance.