(written from a Production point of view)
The first Star Trek: The Original Series episodes released on LaserDisc, "The Menagerie, Parts I & II", were part of the set Television Classics: Volume 1 in 1984, which harkened back to the collection name the first five Original Series VHS/Betamax tapes had been released under, back in 1980 and which had included the "Menagerie" double-bill. The disc was double sided, with one episode on each side, unlike the previous tape versions which had been edited into one feature length episode.
When the TOS episodes began releasing the next year, these two episodes were not re-released, with the exception of its inclusion as part of the Japanese Star Trek - Log 1 laserdisc set. "The Cage" was released twice, once as a color/B&W copy and later, 1991, in full color. This brought the total number of discs up to 42 for the US release. Actually, the regular release also precipitated the complete first-time release of the entire series on VHS/Betamax as well – albeit in the one episode per tape format – , as these were released in simultaneous conjuncture with the discs, sharing similarly designed cover art. As a result, the LaserDiscs were released in groups of five, whereas the video tapes were released in groups of ten.  When Pioneer started to release the LaserDiscs in 1984, they were priced at US$29.98, which was incredibly low when one considered that the in quality inferior video tapes, concurrently released, were still priced at around US$40. 
|The Original Series • The Animated Series • Star Trek films • The Next Generation • Deep Space Nine • Voyager|
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