https://www.thoughtco.com/leonard-ni...hatner-3987061In 2011, Shatner released a documentary called The Captains, where he interviewed actors like Kate Mulgrew and Avery Brooks who played starship captains on the Star Trek series. Apparently, Shatner had asked Nimoy to make an appearance in the documentary. Nimoy refused. Despite that, Shatner's cameraman filmed Nimoy secretly during a convention appearance to include as footage without Nimoy's permission. There was never a final argument or blow out over it, but that seemed to have been the last straw. They never spoke again.