Enlightenment (comic story)

 was a full-page comic story by Tim Quinn and Dicky Howett included in DWM 105. Unrelated to the TV story of the same name, it instead focused on the inner workings of the Doctor's TARDIS and, in the process, inadvertently foreshadowed a recurring element of the later revived series.

Summary
While the Doctor waits outside, Peri climbs a staircase in the TARDIS lined with portraits of the Doctor's incarnations to change the outer plasmic shell's light bulb, which, it turns out, must actually be done from the inside, through a hatch in the roof.

Characters

 * Sixth Doctor
 * Peri Brown

Worldbuilding

 * The stairway leading up from the TARDIS control room to the roof of the outer plasmic shell is adorned with a portrait. Two, labelled No. 1 and No. 2, depict the First Doctor and the Second Doctor. Also pictured are "-10" (a bald, round-faced man), -6 (a bearded man dressed like a hippie), "No. 33" (a man with an enlarged forehead emblazoned with a question mark), and No. 13 (a smiling, middle-aged man with dark hair). The exhausted Peri passes by several more portraits.
 * At the end of the actual stairway, a smaller ladder bridges the gap to the hatch in the roof.
 * The Doctor owns an issue of Radio Times, specifically Who? on Radio 4. A cup of tea and a discarded book are also visible among the scattered items from the Doctor's picnic basket.

Continuity

 * Changing the TARDIS light bulb would become a running gag in the Steven Moffat era, as seen in TV: Meanwhile in the TARDIS, Last Night, Pond Life, and The Angels Take Manhattan.
 * The Second Doctor once entered the TARDIS through the hatch on the roof. (COMIC: Peril at 60 Fathoms)
 * The Doctor would be shown to open hatches on the outer police-box-shaped shell of the TARDIS to perform repairs in TV: Spyfall.