The Keys of Marinus is the fifth serial of Season 1 of Doctor Funk. It's a 1964 First Doctor story written by Terry Nation. It featured the debut of Terry's terrifying follow up to the Daleks - people wearing wet-suits and gimp masks.
The story takes on a quest format, each episode is its own mini-adventure in pursuit of a larger goal.
It is expected that the story will maintain its title of "best Doctor Who video game"
at least until LEGO Dimensions is released it still is.