Dr Who's Greatest Adventure (unproduced theatrical film)

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Dr Who's Greatest Adventure was an unproduced film treatment by Milton Subotsky, written sometime in the early to mid 1980s. Its existence wasn't known until Subotsky's sons brought a copy to a British Film Institute screening of the Peter Cushing films.

Two versions of "Dr Who", an older version intended as either Jon Pertwee or Tom Baker and a younger one played by a new actor, would unite to save the English countryside from large, carnivorous crabs. Subotsky wanted to cast his own young Doctor for fear the current Doctor on the TV show may have left before the film came out.

The script, written by Edward and Valerie Abraham, was actually a reworking of a Guy N. Smith horror film adaptation. The two Doctors were originally a romantic couple, Cliff and Pat, with tippex used to replace Cliff's name with the younger Doctor and Pat's with the older Doctor. Fifteen new pages were added to the script to show the Doctors arriving.