Robin Hood is disenchanted. Maid Marion has left, the Merry Men have settled down, and the legend of the Doctor has retreated deep into the shadows of Sherwood Forest.
But the Doctor is back! (Although this is his first visit - time travel does strange things to a story.) The poor are fed, and the gang are together again.

That is until a desperate King John calls on the deadliest alien force at the nobilities' disposal: the mysterious, shape-shifting Mother Maudlin .

As dark magic is spun, heroes are captured, and the Doctor must find a way to save the Kingdom.

It's time for the return of the Lionheart . . .