The Baron is approaching London with a bouncy castle Zeppelin filled with memory wiping gas. He plans to unleash the gas and persuade the mindless Londoners that he is their leader. DM attacks but in the melee it looks like the Baron has a whiff of his own gas and doesn't know who he is. With a countdown ticking down before the gas is released DM and Penfold must take the Baron on a trip down memory lane to where he grew up so he'll remember the code to stop the crisis! With Penfold embracing his maternal role a little too enthusiastically and a village of Baron-esque lookalikes, Danger Mouse smells a rat... or at least a villainous toad. He's proven right as the village is a setup full of robots and the Baron is faking! DM races to save his friend and contain the mind wiping gas in a gigantic sausage to yet again save the world!

Danger Mouse's plan to hold a surprise party for Professor Squawkencluck is undone when the Baron releases killer birthday presents into the world.