With Atlantis in ruins you would’ve thought Unga Khan would’ve looked a bit more perky this week but no – his same sullen face appears on the recap slides. His plan is to "take his metal tower and all its equipment to the upper world", Sharad is "forever striving to protect his county from destruction", Professor Norton had a "super-submarine" which was sucked into Atlantis, Diana "came to Atlantis in search of headline stories" AGAIN, Billy "pleads with his hypnotized father for recognition" and the late Crash Corrigan "tries to return Norton to his senses", oh and he’s "energetic" too.

All of which is just fluff and bibble because four of those six are already dead. Killed when the whole of Atlantis (or a part of it) collapsed under the projector attack of Unga Khan’s equipment.

My suspicions were first aroused when two black hats chatted smugly outside the City walls. "Shall we go and check the temple for survivors" one of them says. "There is no need – no one could’ve survived that" says the other with a smirk. He orders all black hats return to the tower. Since all black hats are rubbish it can mean only one thing…

Crash lives~!

So do Billy and Diana~!~!

Oh dear – Sharad is dead. Actually dead not assumed dead. Crash breaks the news to Diana and they mourn for exactly four and a half seconds before returning to the serious matter of priming powder, rocket motors, Professor Norton and Unga Khan’s insanity.

Khan declares that nothing in the world can stop him now.

Professor Norton is already hard at work in his laboratory. He appears to be inside a rocket hitting it with a hammer. He is not best pleased to be disturbed by a black hat.

Norton, Khan and the lackey gather in the throne room. Norton explains that the tower will take two hours to reach the surface but he doesn’t know where they will pop out. Khan is cross – he wants to make a grand entrance and orders Norton to give him more accurate info. The professor explains that he’ll need his maps and compasses from the submarine.

Khan orders that the maps and compasses be recovered. How do you think he will achieve this? If you said several hundred men on several hundred horses you would be…

…wrong. He sends the professor and a black hat in the Juggernaut. It is chapter eleven – they may be running low on money by this stage. Let’s face it, it’s only the hardcore fans left after ten weeks of this rubbish.

Norton activates the remote control and the super-submarine surfaces sublimely. The black hat is amazed.

The professor finds his maps (sadly not labelled in a cupboard bearing the legend "Maps") and hurries out to meet his new black hat best friend.

They spy the approach of the white hats. Norton suggests they submerge the ship and take the radio control unit back to the tower. Crash and his friends will be trapped in Atlantis. This is a good plan but the black hat has a better one – leave some Volkites in the submarine to surprise Crash. God I hope we see Volkites trying to climb down a ladder.

Crash is suspicious – the submarine is surfaced and the hatch is open. "Someone has been here" he announces. I bet he deduced that from some disturbed earth or a discarded cigarette butt. Something a bit clever.

Billy asks "Who was it?" and Crash replies "I don’t know". I don’t suppose he noticed that four people knew where the remote control was and only one of them has gone over to the dark side.

Crash has a plan – he’s going to go into the submarine via the safety hatch rather than blundering in via the main door. Billy is to stay behind and make a lot of noise.

The Volkites, dumb as rocks the lot of them, fall for Billy’s distraction and gather at the main ladder with their atom guns.

Crash meanwhile is able to sneak up behind them. At least he would’ve done had he not decided to manfully leap the last few rungs and land with an audible thud. The Volkites turn round and – because they are brilliant - one immediately impales himself on a piece of equipment on the desk.

This is not a joke – the machine broke the little light thing on the Volkite’s chest and it killed him. The same thing happens when Crash shoots the other with an ordinary hand gun. At last we meet an alien menace which isn’t immune to bullets.

Crash opens up one of the Volkites and rummages around inside.

Khan and the professor begin the final test of the rocket motors. They burst into life – ready to carry Khan’s gift of death to all mankind.

Khan orders that all his men and all the Volkites report for the final push. This leads to a very weird scene where the Volkites line up and, one by one, are bashed in the chest with a scroll. Presumably the lackey wants to ensure he’s not giving valuable tower space to figments of his imagination.

But wait! One of the Volkites has gone rogue – it won’t obey the order to stand still and have its chest bashed. This is mutiny – a second Volkite is threatening the lackey with its atom gun. Has faulty wiring caused a hitch in Khan’s plan or has someone been reading Philip K Dick to the Volkites?

I think we have an answer.

Crash orders Unga Khan to undo Professor Norton’s brain washing. But – because he doesn’t trust the evil tyrant – he tells Khan to get into the transforming cubicle too. One nefarious move from the lackey and Khan’s brain is mush.

The Professor is restored to health. We have a clever twist on the earlier "Who are you?" sequence as this time Norton recognises Crash Corrigan even though he is dressed from head to toe in a Volkite suit.

The lackey’s high tech corset is destroyed once and for all.

With Khan and his side kick locked in the transforming cubicle, the Professor safe and well and the control box neutralised it can only mean things have worked out fine. End of serial – no need for chapter twelve. It’s been great being with you these past eleven Saturdays but now we must bid each other farewell from Atlantis…

…oh crap – someone has let them out. Damn him and all his kind.

Khan orders the black hat to start the rocket motors using the master control. He activates a whole bunch of switches and levers and the rockets burst into life.

First the white hat who used to be a black hat (and is now dressed as a Volkite) collapses from the rocket fumes. Then Professor Norton is overcome and finally Crash (also dressed as a Volkite) falls to the ground. The heat and the fumes build as the motors reach lift off thrust and there can be no hope for anyone trapped down there. If the fumes don’t kill them the heat surely will.

Crash Corrigan – so near and yet so far.