Raumschiff Enterprise
In a 2010 review, Zack Handlen of The A.V. Club criticized the Rigellian fever scenario as contrived and noted that Flint being numerous famous men from history was both completely irrelevant and contradictory to his claim that he had kept a low profile to avoid his immortality being discovered. He said that though the final scene is a highlight, it is undermined by Kirk's obsessive love for Rayna being so out-of-character as to be unbelievable. He gave the episode a C, summing it up as "forgettable". In 2017, Den of Geek ranked "Requiem for Methuselah" as the 15th "best worst" "Star Trek: The Original Series" episode, echoing Handlen's criticism that Kirk falling so intensely in love with Rayna over the course of just four hours was highly out-of-character.