Doctor Who: Legacy, a free-to-play puzzle/RPG which revisits the greatest Doctor Who episodes, is now available to download on iOS and Android, BBC Worldwide has announced.

Players can team up with the Doctor and head back through time, building a team of their favourite companions and allies including Clara, Rory, Amy, River, and dozens more.

Players will face the Doctor's greatest enemies, from Daleks, Weeping Angels and The Silence to Headless Monks, Peg Dolls and Spoonheads.

Episodes from seasons 6 and 7 are available at launch, with new episodes, characters (including K9 and Sarah Jane) and other free updates promised throughout December. Season 5 will be released for free in early 2014.

Source: Press release & Google Play, iTunes