In a busy London park, James Smythe and Simone Templar, secret agents, are meant to be observing renowned scientist Professor Sandy Beach. However, with the agents distracted, the Professor is taken kidnap by two men - one big (Paws) and one small (Tic-Tac). Realising that they have mucked-up and are going to be in a lot of trouble back at HQ, the agents leave hurriedly (MISSION IMPLAUSIBLE).
At MI5 Headquarters, ‘Y’ is furious with the agents for the Professors’ disappearance (SECRET AGENT). She tells them that she is bringing in two other agents: Joanna Steed and newcomer Vincent Woods. Steed says they have already identified the kidnappers from a picture taken by a bystander. They are known henchmen of the infamous Dr Yes. ‘Y’ tells them to locate Professor Beach and secure his release by whatever means necessary.
In his lair, Dr Yes meets with his criminal associates. We learn of his current projects around the world, all of which relate to the creation and distribution of single-use plastics. Despite plenty of global successes, Dr Yes is furious about the decline in use of plastic straws. Ivan, who has been heading up the ‘Plastic Straw Revival Project’, protests that he has done his best. Dr Yes feels otherwise and is angered by Ivan’s use of the word “No”, which is prohibited in his company. Ivan is taken away, never to be seen again (YES). Professor Beach is brought in and tasked with inventing a device that can control somebody else’s speech. The Professor asks what will happen if he refuses. Dr Yes tells him that saying “No” is not an option.
The agents meet with the Quartermaster – P – to receive some useful gadgets. ‘Y’ tells the team that intelligence has been received about Dr Yes’ possible whereabouts. The team, hopeful of a trip to the Caribbean, are disappointed to hear that Dr Yes is thought to be based somewhere on the Isle of Wight.
The Prime Minister - Maurice Nonsense - and his Cabinet are meeting in 10 Downing Street to discuss the PM’s exciting new policy – the Green Initiative known informally as “The Last Straw” (SERVING THE PEOPLE).
On the ferry from Portsmouth to the Isle of Wight, the agents meet two nice old ladies, Miss Abby and Miss Martha, who are actually working for Dr Yes (UNLIKELY BADDIES).
Dr Yes learns from Miss Abby and Miss Martha that the agents have arrived on the Isle of Wight. He dispatches Number Two to meet them, disguised as local expert Jeremy Bellamy (THE MAN).
‘Bellamy’ meets with the agents. Too late, they realise it is a trap (I SPY A SPY) and are soon surrounded. Steed and Woods manage to escape, but Smythe and Templar are captured.
Professor Beach reveals his voice/thought control prototype. It looks just like a simple green badge with ‘The Last Straw’ written on it. Dr Yes is delighted and departs for London with his closest cronies, leaving others behind who are disappointed to miss out on the trip (NO-ONE LOVES A HENCHMAN).
At 10 Downing Street, the PM is practising his ‘Last Straw’ speech in front of colleagues and other members of his Cabinet. It is a powerful piece of oratory and he receives warm congratulations from all. Once all others have left, Mike Stove echoes his support for the PM’s speech that is to be given in Parliament that evening. He goes so far as to give the PM a badge to wear with ‘The Last Straw’ written on it, pinning it onto his jacket for him.
In Dr Yes’ lair, the ‘baddies’ left behind to guard the agents feel increasingly like they are missing out on the action. They decide to kill the prisoners and make their own way to London. Sadly for them, their hopes are dashed when Steed, Woods and their back-up arrive just in the nick of time (TIME TO SAVE THE WORLD).
In Parliament, the Prime Minister is giving his speech, but controlled by Dr Yes. Before he can finish, the agents manage to rip the badge from his chest before finally capturing Dr Yes (MISSION IMPLAUSIBLE – REPRISE)