Doctor Who (2005) (2005)

S10E11 World Enough and Time (1)

The Doctor's deep bond with his friends leads him to make a perilous choice. Stranded aboard a colossal spacecraft teetering on the edge of a black hole's event horizon, he experiences the loss of a loved one whom he vowed to safeguard. Can he find a way to atone for his error, or has he already set off a chain of irreversible events? For a change, time becomes the Doctor's greatest adversary.