Missy appeared to have, perhaps understandably, joined forces with her goateed former self by the end of the hour, which puts her winking about receiving a distress call at the beginning of the hour in a new light. [...] with the Master returning, "World Enough and Time" -- which gets its name from the metaphysical poem "To His Coy Mistress" by Andrew Marvell -- played with time in a way the series hasn't really attempted lately.