The latest episode of Strange New Worlds is an emotionally heavy story featuring an ending some Star Trek fans will find controversial. The episode ties back to Star Trek: Discovery and the war between the Klingon Empire and the Federation. However, amidst all this emotionally weighty drama, there's a cameo from an actor who appeared in The Original Series. Clint Howard plays Chief Medical Officer Commander Martinez, but everyone calls him "Buck."
Source:https://www.cbr.com/strange-new-worlds-clint-howard-war-episode-return-star-trek/