Danger Mouse and Penfold are celebrating another noisy victory, gleefully ringing Big Ben's bell, when an over-excited Penfold falls, pushing the clock hand forward, causing the sun to go down prematurely. Unbeknownst to them a mysterious figure watches on from nearby, noting the clock's incredible time-controlling powers. When DM realises that the day is being stolen and replaced with a silent night, he enlists the help of expert colleagues - the night shift! With Danger Moth and Danger Mole in tow, the team track the quiet culprit. But a noisy Danger Mouse might just be outwitted by this stealthy saboteur.

A mishap on a mission leaves Danger Mouse confused - why is Penfold not talking to him? It might be because today is Penfold's birthday and he hasn't remembered it again! Squawk sprays DM with her experimental empathy gas in the hope that he will find it easier to care about other people. The newly empathetic DM is a changed mouse! One who seems to think breaking the Baron out of prison is a great idea.