The Sonners are looking after Granny and Grandpa's cat, Casper. Lola absolutely adores Casper, and Lotta also finds that she quite likes him. Lola and Lotta also discover something that they like -- a new game that they've made up in which they call Charlie and Marv for help, even when they don't really need it. They soon find, however, that their game has a certain side effect.