First slip was a fielding position in cricket. Peri implied their existence at the 1981 Ashes series by telling the Fifth Doctor, "A second slip seems kind of careless after the first one." (PROSE: Graham Dilley Saves the World)

Behind the scenes Edit

Although the Doctor explicitly calls second slip — and therefore by implication first slip — a fielding position, it's more specifically a catching position. Slips are behind the batsman, like catchers in baseball, who are hoping to catch the ball after it's nicked the bat, and thereby catch the batsman out.

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