London has been shrouded in darkness for almost a week, so Danger Mouse and Penfold head off into outer space to investigate. There they encounter a anti-logic spaceship manned by The Gremlin, who plans to turn the entire Earth Topsy turvy.
Stiletto steals a batch of recently developed passport pictures of Penfold. Il Barone proceeds to use his new puppet personality projector to take over Penfolds' mind, what little there is of it, and turn him into an assassin.