This story marks the only farewell scene between the Seventh Doctor and one of his companions.

This short story marks his first published fiction.

The story marks the return of Turlough in the latest chronology.

This story marks the final appearance of the "howlaround" title sequence introduced in 1970.

This story marks the first appearance of the Doctor's yellow vintage car, Bessie.

This story marks the first appearance of the Daleks.

As a result, this story marks the beginning of the turn away from historical stories.

The stories mark a return to Călugăru's preoccupation with rural and suburban life.

Persistent stories mark syphilis as the cause of Lenin's death.

The story may mark the moment at which the notion of a serious so-called disconnect between the public and the press became conventional wisdom.