When Bob's best friend Gummy goes missing, Lloyd and Abacus take on the task of finding him... which is only right as they were the ones who lost him. Lloyd suspects foul play, so he compiles a list of suspects and starts following the clues.

Lloyd's plans with Abacus are ruined when he has to go on a family trip to Caterpillar World, but PB can't wait - she's finally going to find out the gory details of what happens inside a chrysalis! However, the show is not what either of them was expecting...