By Katie Hims. Merle is a penguin keeper at London Zoo. When her sister Beth fails to make a date at the cinema, she goes searching for her. She soon realises that Beth has been abducted by aliens - not for the first time. Merle ...... Abigail Davies Linus ...... Matthew Wilson Gina ...... Serena Bobowski Frank ...... Dominic Hawksley Beth ...... Madeleine Bowyer Ania ...... Ania Tomaszewska Chris ...... Chris Nelson Directed by Boz Temple-Morris A Boz Temple Morris production for BBC Radio 4.