The Visitor.

The only episode of Deep Space Nine to be nominated for the Hugo Award, "The Visitor" is a moving story that works with or without the Star Trek elements. This account of Jake Sisko's life following the apparent death of his father tugs on the heartstrings and effectively conveys an enormous sense of loss, anguish, and guilt. In this episode of The Orb hosts Christopher Jones and Matthew Rushing are joined by sociology professor John Tenuto to discuss this unique and powerful episode, what it says about the importance of fathers, and why it is quietly one of the greatest Star Trek episodes of all time.