After a dalliance with Tennant era grandiosity, it's back to the standard Something Who format, comparing the 4th Doctor story The Invisible Enemy from 1977 with 2009's Tenth Doctor story The Waters of Mars. Yes, you guessed it, it's our Virus Special.

Richard is joined by Simon and Giles, and also, moonlighting from his new regular slot on the Missing Episodes podcast, Paul.

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The opening music is Three Guitars Mood 2 and, yes, that is Richard playing the ukulele and kazoo on possibly the worst ever version of the Doctor Who theme tune at the end.