Tonight’s new episode, “The Lie of the Land” (lie, not lay – get it?), concludes this unofficial trilogy story line about the menacing alien monks. In the first episode, the end of the Earth turned out to be an artificial test-run simulation before the monks’ actual invasion. In the second episode, the blinded Doctor (Peter Capaldi) regained his sight, but potentially at the loss of Earth for real. But tonight, the Doctor and his companions have one last chance to save the planet, and themselves. Things look grim – but even in a season when he’s supposed to regenerate to another form (and a new star playing the title role), never bet against the Doctor.