Superman

Superman was a fictional superhero that crash-landed on Earth as a baby, and was given the name Clark Kent. He was the last of his kind. Superman was the main character of a comic book series of the same name.

In 1957, Korky Goldsmith claimed that Superman and Nyssa "would get along like a house on fire" as she was likewise the last survivor of her planet. (AUDIO: 1963: Fanfare for the Common Men)

The Twelfth Doctor read a Superman comic, and revealed to Grant Gordon that Superman and Clark Kent were the same person, making the point by drawing Clark Kent's glasses on Superman. When Grant told him that it was known by everyone (in the real world), the Doctor noted that Lois Lane did not know despite being a reporter. (TV: The Return of Doctor Mysterio)

Behind the scenes
As a child, a fictional version of Tom Baker recalled becoming jealous of the orphan children who would be gifted Superman comics from visited American soldiers. (NOTVALID: Who on Earth is Tom Baker)

As he revealed at the 2016 New York Comic Con, Superman, or more specifically Clark Kent, is Steven Moffat's favourite superhero.

Superman appears as a character in LEGO Dimensions.