[3] Whereas the contemporary television incarnation of the character was depicted as an abrasive, patronising and cantankerous extraterrestrial, as portrayed by Cushing, Dr. Who is an avuncular, eccentric inventor who claims to have created a time machine, named Tardis, in his back garden.

Unlike his TV counterpart, for whom the character's name is ambiguous, his surname is clearly stated to be "Who" in both films.

In the sequel, Susan is joined by Dr. Who's niece Louise (Jill Curzon) and police constable Tom Campbell (Bernard Cribbins).

[7] There were plans for a third film based on the Doctor Who television serial The Chase, but these were abandoned following the poor box office reception of Daleks' Invasion Earth 2150 A.D..[1] Roberta Tovey reprised her role as Susan for a minisode in the documentary More than... 30 Years in the TARDIS.

Set in a Dalek-infested London of the 22nd century, it shows a Black and Red Dalek and two Robomen moving past Tardis without noticing it.

In an interview following the skit Tovey revealed her hopes for a follow-up to the two Cushing films, centring on an adult version of their Susan having taken on her grandfather's mantle as an adventurer in time and space.

The script was written by future Doctor Who TV series writer Malcolm Hulke.