Spock

Mr. Spock was a fictional character played by Leonard Nimoy in the television show Star Trek.

Rose Tyler used the alias of 'Mr Spock' for the Doctor when telling Captain Jack Harkness about the Doctor. (DW: The Empty Child)

Later, Donna Noble once compared the Doctor's method of reading a person's thoughts with that of Spock's "mind meld". (BBCR: The Nemonite Invasion)