The fourth and final episode of Doctor Who: The Adventure Games, Shadows of the Vashta Nerada, is now online.

Following on from the ending of third episode TARDIS, it features a plot surrounding a real-world conspiracy and is set in a seabed colony called Poseidon.

The game was initially due to be released on Christmas Day, but as an early treat, fans can now download the episode for both PC and Mac for free from the BBC Doctor Who website.

[Source: BBC Doctor Who website]

The fourth and final episode of Doctor Who: The Adventure Games will be released on Christmas Day, it has been confirmed.

Titled 'Shadows Of Vashta Nerada', it will feature the first appearance of the shadow monsters since their debut in 'Silence In The Library' and 'Forest Of The Dead'.

Following on from the ending of third episode 'TARDIS', it will feature a plot surrounding a real-world conspiracy and is set in a seabed colony called Poseidon.

"We’ve gone all-out for the season finale. 'Shadows of the Vashta Nerada' takes place entirely underwater - something which would be impossible for the TV series, as water is so expensive," said executive producer Steven Moffat.

"It’s thrilling, terrifying, educational and fun. Just steer clear of those shadows..."

UK licence fee payers can download the episode for both PC and Mac for free from the BBC website.

[Source: Digital Spy]