Bob Denver was drafted during the production of the series' fourth produced episode, "The Big Sandwich". Maynard was therefore written out of the series with the episode "Maynard's Farewell to the Troops', and Michael J. Pollard was cast as Maynard's cousin Jerome Krebs, who would assume Maynard's role in future episodes. However, Denver failed his Army physical and was rejected "4F" by the draft board. After shooting two episodes with Pollard, it was decided to rehire Denver and write Maynard back into the show. Pollard had signed a "play-or-pay" contract, and was paid for all 30 episodes he had been signed for upon his dismissal.