David Francis Somerville Learner (born 23 August 1955 in Hammersmith, London) is a British actor who is best known for playing Marvin the Paranoid Android in The Hitchhiker's Guide to the Galaxy and Pickle in the CITV adventure game show Knightmare.

Pickle sometimes broke the rules, by sneaking food into the Dungeoneers Knapsack and famously stepped into the game during one episode to fend off an enemy attack against a contestant, which infuriated Treguard (played by Hugo Myatt).

[2] On Sky 1 in 2004 Marvin the Paranoid Android came 7th in a poll counting down the "Top Ten Sci-Fi Robots", Learner was interviewed for it along with actors such as Robert Llewellyn (Kryten) and John Leeson (K-9).

On 9 May 2013, he appeared in a Script in Hand performance of "The Beau Defeated" by Mary Pix as part of the Restoring the Repertoire project run by the Theatre Royal, Bury St Edmunds.

In 2017, Learner provided the voice of Cyril the Farmbot and the narrator in a live-action pitch trailer for 'Minding Mama', a comic book series written by EJ Jackson and illustrated by Dan Schaefer.