Newsround went behind the scenes during the filming of the second episode of Doctor Who - The End of the World.
Tim Masters reports from a space station five billion years in the future (somewhere in Cardiff!).
Almost as soon as I arrive outside the Doctor Who set in central Cardiff, a minibus pulls up and out jump several alien creatures that I can only describe as "tree people".
As they trudge through the mud, gathering up their robes, it's clear this is going to be a very unusual day.
Jabe - a tree woman
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The inside of the building, the Temple of Peace, has been transformed into a stunning space hotel. The main hall is flanked by huge marble pillars and at one end there is a massive window.
Throughout the hall are glass cabinets containing old relics from Earth's history. One contains a battered old copy of Harry Potter and the Philospher's Stone.
Newsround namecheck
On set, the Doctor (played by Christopher Eccleston) and Rose (Billie Piper) are rehearsing a scene before the cameras roll.
They are discussing the destruction of Earth by the sun. A line of dialogue from Rose stands out: "But hold on, they did that once on Newsround Extra - the sun is expanding, that takes hundreds of years."
Wow - Newsround is still getting talked about in five billion years' time!
Monster medley
The Face of Boe
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Doctor Who producer Phil Collinson gives me a quick tour of the set in between takes. "We've got all the monsters here today, more than ever before."
And he's not joking. As well as the tree people, there's a huge animatronic head in a glass tank (the Face of Boe), blue-skinned aliens, and a flat piece of skin with a face on it - Lady Cassandra - the last human.
Phil's job as producer is to oversee the production from script to screen. He says one episode takes two weeks to film - and there are 13 episodes in all.
Lady Cassandra - the oldest human
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Billie Piper, who plays 19-year-old Earth girl Rose, tells Newsround that she's keen not to focus on what's been done on Doctor Who in the past.
"This is a whole new approach," she says. "This is about the Doctor and Rose and friendship - that's the core of every tale."
The end of the Earth
I sit at one end of the set while the director Euros Lyn gathers a huge number of extras in the hall and explains a bit about the story.
The Steward
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"You are the servants in the most expensive hotel in the universe," he says. "The richest people in the universe have gathered to watch the destruction of the Earth."
It's a major job getting everyone to move into the right positions on cue. There is a group of children from a local drama school who are playing alien servants.
Big entrance
Moxx of Balhoon
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Out in the lobby, assorted aliens are having their make-up touched up before the cameras roll for the big entrance scene.
Now there are even more tree people, a small blue alien with a huge head called the Moxx of Balhoon, and strange bird creatures with heads like pterodactyls.
My only regret is that there's no sign of the Doctor's greatest enemy - the Daleks! They are destined to return in a future episode...
Doctor Who is on Saturdays on BBC One at 7pm.
Check out the Newsround Showbiz Doctor Who special on Saturday at 3.50pm on the CBBC Channel.