An underwater base, a flooded village, an abandoned spaceship, mysterious symbols, and an alien ghost? All in a day\u2019s work for the Doctor and Clara. Join us as we break down \u201cUnder the Lake\u201d and look ahead to next week\u2019s \u201cBefore the Flood.\u201d Also, did anyone notice that this is all just a big game of Pac-Man?