The Celestial Toymaker is the mostly missing seventh serial of the third season in the British science fiction television programme Doctor Who, which was first broadcast in four weekly parts from 2 to 23 April 1966.

An alien intelligence has invaded the TARDIS and rendered the First Doctor invisible, leaving Dodo and Steven incredulous.

The Doctor appears in the Toymaker's study, where he is given the Trilogic game, a ten-piece puzzle (similar to the Tower of Hanoi) whose pieces must all be moved and remounted in a 1023-move sequence.

The clowns are made to replay the game when it is clear they are cheating, and the second time round Joey loses his footing on an obstacle course and the challengers are transformed into twisted dolls on the floor.

Steven and Dodo then venture down a corridor into another chamber with three chairs and a challenge from living playing cards, the King and Queen of Hearts, along with a Knave and a Joker.

Dodo and Steven find themselves in a vast game of hopscotch against Cyril, who slips on a triangle he has booby-trapped and is electrocuted.

The three friends are reunited, with Steven and Dodo sent into the TARDIS for safety while the Toymaker challenges the Doctor to complete the Game.

After Tosh finished work on the scripts, his successor, Gerry Davis, was forced to make further rewrites due to a budget shortfall.

The BBC's head of serials, Gerald Savory, vetoed the idea and extended Hartnell’s contract, leading to Wiles quitting in protest.

This serial is one of the more well-documented of Season 3's broadcast without tele-snaps, so more photographs of these elements survive than the preceding stories, including the sets, costumes and actual colour of everything.

[9] ^† Episode is missing BBC Television, the producers, received complaints from lawyers acting on behalf of the late Frank Richards' estate.

The character Cyril (played by Peter Stephens), who was fat and wore glasses, was said to bear a remarkable resemblance to fictional schoolboy Billy Bunter.

[14] The BBC's Audience Research Report on the final episode found that it "had little appeal for a large proportion of the sample, over a third of whom actually disliked it."

[15] The serial was positively received by Patrick Mulkern of Radio Times who said the first episode was "undoubtedly a fantasy classic".

Mulkern thought that Michael Gough did not get much screen time in his role as the Toymaker, but "exudes menace ... and has that fabulous voice."

One of these narrations is deliberately inserted to obscure a line in "The Hall of Dolls" where the King of Hearts recites a version of "Eeny, meeny, miny, moe" that includes a racial slur.