Okay, this is an average episode that is still pretty interesting,...though I've gotta admit that the plot is pretty hard to believe--even for a sci-fi series. Think about it--some god-like and practically immortal beings are stuck inside orbs well beneath the surface of a planet. They need to borrow some of the bodies of the Enterprise crew in order to then fashion android bodies for themselves. You'd really think that being that powerful, they wouldn't need to go through all this rigmarole! Well, regardless, there are three super-beings still alive after all these many, many millenia and so Kirk, Spock and Diana Muldaur's character allow the three beings to use their bodies temporarily. However, the being inside Spock is selfish and evil and tries to kill off his rival being and he has no intention of giving Spock back his body. It's all very unusual, but not super-compelling. The episode is worth watching but is not among their best.
Review of Return to Tomorrow
