We watch “Before The Flood” (Series 9, Episode 4) where Clara fends off the advances of future/past Ghost Doctor and past Doctor fights off the advances of the Mork-free Fisher King from 1980. Whilst said Nanu Nanu-ing is occurring [ask your Coke (wink) addled parents younglings], the Doctor proves to be the Ace of Bass-ing, Clara is forced to read the Doctor’s cue cards, and the Fisher King is far less hairy than expected. (Google Robin Williams body hair if you dare... shudder) All this and a bootstrap paradox? Sweet!