We're thrilled to once again be joined by legendary director Ralph Senensky for our deep dive of his 5th "Star Trek" episode, "Return to Tomorrow."

After being lured by a distress signal to a distant planet in an unexplored region of the galaxy, the Enterprise crew encounters the last three surviving members of a long-dead civilization. Led by Sargon, these powerful beings, now housed in receptacles, need the consent of Captain Kirk, Mr. Spock and Dr. Ann Mulhall to temporarily house their bodies, so they can build android robots for themselves that will permanently host their forces of energy. But the being inhabiting Spock's body has no intention of vacating his flesh-and-blood host, and he will stop at nothing to keep it, even if it means killing Sargon -- and, in effect, Captain Kirk and Mr. Spock -- to do it. Despite some inconsistencies and contrivances, "Return to Tomorrow" overcomes its flaws to ultimately succeed as an engaging and entertaining "Star Trek" episode. That's largely due to a number of factors, including a standout performance from Leonard Nimoy, a beautiful score composed by George Duning and, perhaps most of all, the rousing and passionate delivery of Captain Kirk's iconic "Risk is our business!" speech by William Shatner.

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