John Carter is a war-weary, former military captain who's inexplicably transported to the mysterious and exotic planet of Barsoom (Mars) and reluctantly becomes embroiled in an epic conflict. It's a world on the brink of collapse, and Carter rediscovers his humanity when he realizes the survival of Barsoom and its people rests in his hands.

David Tennant and Michael Sheen (playing themselves) were due to star in a production of 'Six Characters in Search of an Author' in the West End. The pandemic has put an end to that, but their director (Simon Evans) is determined not to let the opportunity pass them by.