Casanova

In 1580 Venice, after the Eleventh Doctor realised that Casanova wouldn't be born for another 145 years, the Doctor told Amy Pond and Rory Williams that he didn't want to run into Casanova, as he owed him a chicken in a bet. (TV: The Vampires of Venice) He later claimed to Valarie Lockwood the chicken was repayment for Casanova helping thwart a Sontaran invasion. (AUDIO: The House of Masks)

On Red Rocket Rising, Lucie Miller described the Eighth Doctor as "that bloke dressed like Casanova". (AUDIO: Blood of the Daleks)

Behind the scenes

 * David Tennant played Casanova in the written by Russell T Davies, directed by Sheree Folkson and exec produced by Davies and Julie Gardner. In The Christmas Invasion, the blue coat that Tennant wore as Casanova in the miniseries can be seen in the TARDIS wardrobe as the Tenth Doctor chooses his outfit. He was also played by Frank Finlay in an earlier version.
 * A standalone panel by comic artist Lee Sullivan shows Tennant's Casanova meeting the Ninth Doctor and Rose Tyler amidst an invasion of Venice's St Mark's Square by bronze Daleks.
 * Tennant's role as Casanova was recalled in The Ballad of Russell and Julie, where Catherine Tate, playing Julie Gardner, remarks "We'll get the lovely fellow in from Casanova!" for the role of the Tenth Doctor after Ninth Doctor actor Christopher Eccleston left Doctor Who.