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If you’re heading into the vacuum of space the one thing you’ll need a lot of is oxygen.

The Doctor warns his university students about the horrors of space suffocation before he, Bill and Nardole boldly take the TARDIS to a massive space station, Chasm Forge, where air is in very short supply.

They also discover that of the 40-strong crew only four remain – including a mysterious blue-skinned alien and a grieving husband – while the rest of them have become zombies.

The adventure then turns into an intergalactic episode of The Walking Dead as the TARDIS trio get into custom-made space suits, putting themselves in great danger to help the survivors avoid a mass zombie attack…