Barnaby's parents deny that Mr. O'Malley is real and take Barnaby to a number of child psychologists. They continue this denial even when Mr. O'Malley is seen flying past their picture window, when he walks into their living room, and even after Mr. O'Malley is elected their representative to Congress.
The strip ended when Barnaby finally reached his sixth birthday, the magical point beyond which he could no longer have a fairy godfather. With much regret, Mr. O'Malley left, and so (after a short-lived attempt in the 1960s to revive the strip by redoing the original stories) did Johnson, to pursue other interests.
Selected strips from Barnaby were re-published in the 1960s by Dover Books, and later reprints from the 1980s still command high prices from used book sellers.