The Snowmen (in-universe)

From Tardis Wiki, the free Doctor Who reference

You may be looking for the real world television story.

The Snowmen was an episode of the television series, Doctor Who. The story featured the Doctor as portrayed by Matt Smith, and an individual portraying a character who resembled Walter Simeon.

On Red Nose Day 2013, clips from the episode played on a screen behind Claudia Winkleman, Dermot O'Leary, and the Eleventh Doctor. (TV: The Doctor Appears)

The back cover of the Series 7 DVD boxset. (COMIC: The Girl Who Loved Doctor Who)

In a parallel universe in which the Doctor's life was a work of fiction, it was the sixth episode of the seventh series. It was released along with the rest of the series in a DVD boxset. (COMIC: The Girl Who Loved Doctor Who)