It was adapted for tv from a shorter 1963 theatrical feature film, Madmen of Mandoras, and was lengthened by about 20 minutes with further footage shot by UCLA students at the request of the distributor. The 2nd period carries on the topic of revisiting old haunts by combining a Time Travel plot with the re-introduction of Trickster Mentor Q, and the 3rd will function the return of the complete core TNG solid as standard, opening-credits actors.
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This appeared in I, Jedi, a Star Wars Legends novel showcasing Corran Horn, whose father, secretly the son of a Jedi, had died several years in advance of, and still left a holographic message for him. In The Thin Red Line, there are quite a few examples.