Dennis and the gang are fed up with dinner lady Olive's completely inedible school dinners. In their mission to 'drop the slop', they discover a poster of her past career as a singer. The gang ask her to join The Dinmakers, hoping she'll swap a life in the kitchen for fame. However, after unleashing Olive's inner diva, their new mission is how to get Olive back into the kitchen!

Dennis must escape detention and Bash Street School to make the Beanotown Brawny Bean Race before Walter wins it! With the help of a note placed in his desk, he must sneak past Mrs Creecher and make a run for it - unless the mysterious note-giver stops him first.