A great little reflective piece. The Doctor finally reaches 1963, but is too early. He forbids his companions, who can finally taste escape, their freedom.

This story has a sci-fi element with the party arriving too early in their own timeline, but the focus is on character conflict instead. It is done perfectly. It’s a great mid-point in the doctor's growth, and subtly gives us some background on him, his granddaughter and their drives for travel. It gets resolved with a good talk, but it doesn’t feel cheap. It is very clear that the Doctor cares about these people, but he has trouble just saying that out loud.