A visit to a natural history museum proves catastrophic for two high school rivals, an overachiever and a jock, when an ancient Aztec statue casts a spell that causes them to switch bodies and see exactly what it’s like to walk in the other’s shoes.

In 2013, something terrible is awakening in London’s National Gallery; in 1562, a murderous plot is afoot in Elizabethan England; and somewhere in space an ancient battle reaches its devastating conclusion. All of reality is at stake as the Doctor’s own dangerous past comes back to haunt him.