To be honest, we don’t know what happened to the man John at the end of the last episode. Chris had been arrested by the police and, presumably instead of a phone call, he was allowed the chance to prove his nutty conspiracy theory of choice before being banged up forever more. Chris went down to the cellar of the junk shop where he knew that the alien Robert was keeping John prisoner only to find the place deserted and with a wall where the prison cell door used to be. Cue hysterics, cue over acting, cue embarrassment on the DVD commentary and then cue the theme music.

Chris is lead away by sympathetic police officers while he cries about walls and friends and special powers. The boys in blue are having none of it.

The old gimmer recognises Chris – he’s one of the hoodlums who broke in a couple of nights ago and ran away when he got his shot gun out. ‘Ello ‘ello ‘ello – what’s all this about a shot gun? Have you got a licence for that? Suddenly, and to the old gimmer’s distress, there are bigger eggs to fry than a spot of reckless driving from Comrade Harding.

In the confusion Chris is able to leg it.

He locks them in the cellar and pops the key in the till. I think that just above proves his innocence – well worth popping round and having a rummage.

Ok – only one of those long, drawn out "oks" that don’t really work on the page – we’re suddenly in Robert’s futuristic apartment and he’s giving John a cup of alien tea.

Chris goes to the lab and explains that he escaped but that he thinks the police will probably try and charge him with murdering Robert.

Don’t worry – TIM has a plan. He’s going to erase the computer records of Chris’s arrest and one of the TPs will wipe the police officers’ minds. Sorted.

Robert is explaining things to John. His race fly through space without ships and lay their eggs on nearby worlds. Robert never knew his parents – he’s guided entirely by instinct.

In order for him – and the thousands like him – to leave Earth, their swarming must be powered by the energy of anger and violence. Basically, they’re going to piss the whole planet off. Like Tony Blair. Maybe he was a swarming alien cuckoo monster as well.

Robert’s mother was responsible for the blue and green business in ancient Constantinople (which, as everyone who went to school in the 80s, is very hard to spell – can you spell it?)

Robert was hoping the TPs rescuing John would generate enough violent energy for him to escape. But, as John explains, this was wrong blah blah pacifists blah blah do you like my hair?

John jaunts back to the lab. "How’s the world situation?" he asks. "Not good would be an understatement" replies TIM. Which would’ve been a good answer if John had asked "TIM – please understate the world situation".

They watch some graining footage of riots while Robert starts accumulating small children that have modelled their wardrobe on Dr Smith from TV’s "Lost in Space".

The TPs have a real moral quandary – stop the swarming and thousands of aliens will die, let the swarming happen and thousands of humans will die. Amidst all this, Chris falls asleep.

He’s having a nightmare. It probably involves being in Emmerdale many years later and furiously denying having ever been in the Tomorrow People.

This gives Stephen and John an idea – put the whole world to sleep and let their violent dreams give the aliens the energy they need to swarm. Brilliant. Only snag, says Elizabeth, is how do you put the whole world to sleep?

More weird alien children arrive and Robert points to chairs. He’s only got four chairs so any other weird alien children arriving will have to stand. He’s not really thought this bit through.

Close up on Stephen. He’s not got a clue. Lingering close up. Still no inspiration. Close up continues. Maybe they’ve run out of weird looking children and footage of riots.

Stephen comes good and justifies that lingering close up – a giant stun gun in space would put the world to sleep and give them all bad dreams. But how do you get a giant stun gun into space?

Answer – put on your space suits and jaunt into space. The rest will take care of itself.

Told you – more weird alien children arrive and there aren’t enough chairs.

Stephen jaunts into a scrap yard and puts a gizmo on the giant magnet.

The crane driver can’t believe his mince pies when it disappears. Lord love a duck.

Meanwhile, in space...

...Stephen is fitting the magnet to a satellite to turn it into a stun gun. Text book.

Oh and Chris’s jeep is spotted by police and last week’s car chase breaks out yet again.

While all this is going on, Robert is painting a picture of the world. With Great Britain at the centre as it ought to be. Rah.

Back in space, John, Stephen and Liz find the solar motor drive external release control panel and extract – the very thing I said they’d need in order to carry out their plan.

More stock footage and a warning from TIM that things are getting worse all the time. Yes, the thousands of rioters we saw earlier have been replaced by dozens of rioters. It’s getting out of control.

They’re now working on the control unit 14473211 central motor drive red positive. That has to be a good sign – they’ve done 14,473,210 control units and must be near the end by now.

Chris is goosed – trapped by some elementary police driving and about to be brought to book. Sucks to be Chris.

Things start to get weird.

But the TPs have finished their amendments to the satellite so maybe all is well as well as weird.

Child A turns into a ball of energy. It’s not great TV but it’s better than the lengthy frisking Chris is getting from the police.

Meanwhile, in space, the TPs have floated into the control room and are about to send the world to sleep.

ZAP~!

They all fall down.

The hatching is reaching a critical stage...

...the sleepers are having violent dreams...

...the people are taking forty winks...

...one man dreams of having sex with his car...

...another man manages to sleep in a very camp pose...

...and TIM gives them the good news – they did it – the whole world is asleep.

The alien children fly off into space in their swarm and everyone is fine.

Robert stops on his way past the satellite and thanks them for all their help. Awww – such a nice boy.

Sometime later, Stephen has wiped the minds of the police and they all have a good laugh about it.

They wake up in a fond embrace and with no memories of how they got there. I’ve had mornings like that. Though never, as far as I know, with a police inspector.