Popeye
From Tardis Wiki, the free Doctor Who reference
Popeye was a comic strip featuring a character of the same name. Malcolm enjoyed reading it when he was six years old in 1963. It had a character named Wimpy, who lent his name to London's Wimpy Bar. (PROSE: Time and Relative)
The Fourth Doctor whistled the theme to Popeye while visiting a Shanghai dock in 1937. (PROSE: The Shadow of Weng-Chiang)
Other than Popeye, characters includeed Olive Oyl and her brother Castor. The Doctor jokeed that the spaceship Castor may have been named after him. (PROSE: Wooden Heart)