Shatner's performance is still low-key in this episode, but his character makes a questionable decision. Shatner portrays Kirk as well as an android, and both performances are believable. However, I do find it interesting that Kirk - in a universe that supposedly has everyone equal, racism abolished, first interracial kisses happening or only being acknowledged between black individuals and non-black (usually white) individuals - has to resort to racial remarks about Spock's heritage in order to distort the android's programming - Kirk's android double, that is. I think the writers could have concocted something else much more clever. One has to wonder if if Spock was portrayed by someone who was scripted as biracial and human - for example, a black and Asian male - would Kirk's remarks been as accepted?