A Fix with Sontarans

"A Fix with Sontarans" is a specially written segment produced for the BBC children's programme "Jim'll Fix It" featuring Colin Baker in character as the Sixth Doctor. It was broadcast on 23 February 1985.
Plot.
The Sixth Doctor (Colin Baker) is working the controls in the TARDIS, and he accidentally teleports his former companion Tegan Jovanka (Janet Fielding) on board. She is less than happy about this, and reluctantly agrees to help the Time Lord. He reveals that two Sontarans are on board, and they possess a powerful vitrox bomb with which they intend to blow up the time machine.
The Doctor then accidentally beams on board an Earthling called Gareth Jenkins, who happens to be dressed in an outfit similar to his own. Gareth agrees to help in any way he can, and helps The Doctor set a trap for the Sontarans. The two aliens break into the console room, destroying one of the TARDIS's doors in the process, much to the Doctor's indignation. The leader introduces himself as Group Marshall Nathan and demands that the Doctor introduces his group. Upon hearing Gareth's name, Nathan reveals that in 2001 their invasion of Earth would be foiled by a brave rebel called Gareth Jenkins; and if they kill him now their future success is assured. However, Gareth springs their trap and kills the two villains. Jimmy Savile then appears and presents Gareth with his "Jim'll Fix It" medal, as well as the prop "Mezon gun" the Sontarans used.
Production.
In the Built for War DVD Extra found in "The Sontaran Experiment", Colin Baker said, "Jimmy Savile is much more frightening than the Sontarans."
During the fallout of the Jimmy Savile sexual abuse scandal, Colin Baker expressed how he felt very uncomfortable with Savile during the filming of this scene. In an article for Bucks Free Press on 9 November 2012, Baker wrote:
Cast notes.
Janet Fielding was asked to participate in the sketch when Nicola Bryant proved unavailable to reprise her role as the Doctor's then-current assistant Peri Brown.
The young Gareth Jenkins in this broadcast is not the same Gareth Jenkins who currently works as a composer, audio engineer, and actor for "Doctor Who" audio play producers Big Finish, but is in fact the current Head of Campaigns for children's charity Save the Children.
Broadcast and releases.
"A Fix with Sontarans" was broadcast during the run of "The Two Doctors" (on the same day as Part 2) and is featured as an extra on the DVD release of that story. Later pressings of the Region 2 DVD have removed the segment due to the Jimmy Savile sexual abuse scandal.