After a pogo-stick palaver in gym class, Mrs Creecher decides Beanotown ain't big enough for her and Dennis, and calls it a day. Surely a result for Dennis and his trusty pals - substitute teachers are always a pushover! Little does he know Mr De Testa has lined up the one person who Dennis can't outsmart - his very own Mum! How can he possibly convince Mrs Creecher to come back? And will he ever live this down?