NOVA captivates a remarkably candid portrait of Nobel prize-winning physicist Richard Feynman, a man of few pretensions and tremendous personal charm, who speaks with the same passion about a child's toy wagon and the frontiers of subatomic physics.

Tegan steers the TARDIS to the planet Manussa, without meaning to - but why? And is it a coincidence that the planet is about to celebrate the 500th anniversary of the expulsion of the insidious Mara?