Dick Martin costarred in the first half of the first season (1962-1963), of THE LUCY SHOW, as Lucy Carmichael's next-door-neighbor and occasional boyfriend Harry.
Although Lucy & Desi divorced in 1960, THE LUCY SHOW launched in 1962 with Desi Arnaz as Executive Producer, and still President of Desilu.
Dick Martin was cast, intended to serve the "Ricky" function. But the role never developed beyond walk-on appearances, and episodes focused on the Lucy/Vivian [Vance] relationship. Late 1962, Desi sold his stock to Lucy, she became the President of Desilu, and new husband Gary Morton took over as the sitcom's Exec. Producer... Dick Martin's character was shortly dropped entirely.
Here's one of Dick Martin's LUCY episodes, prior to leaving the series...
"Lucy and Viv Put in a Shower"
Part 1
[youtube=425,350]UbEJdq1UJts[/youtube]
Part 2
[youtube=425,350]QdrblhEVaWw[/youtube]
Part 3
[youtube=425,350]4UL4VrqVWXE[/youtube]
Part 4
[youtube=425,350]iNiw8JcE0Hs[/youtube]
Part 5
[youtube=425,350]TRT74YyKCSw[/youtube]