Logopolis

	doctor	Tom Baker ( Fourth Doctor )<br> Peter Davison ( Fifth Doctor )
	writer	Christopher H Bidmead
	director	Peter Grimwade
	script Editor	Christopher H Bidmead
	producer	John Nathan-Turner
	executive Producer	Barry Letts
	production Code	5V
	series	Season 18
	length	4 episodes, 25 mins each
	date	February 28 &ndash March 21 , 1981
	preceding	The Keeper Of Traken
	following	Castrovalva

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