Star Trek: The Next Generation, Season 1, Episode 25 (May 1988), “Conspiracy”, was one of my favorites. It featured a mind-controlling alien parasite referred to as the “Nubbin bug”, or at least by The Greatest Generation Star Trek podcast.
Back in 1998, there was not a lot of computer CGI, so it was a stop-motion prop. Years later, the co-hosts of The Greatest Generation, a fun Star Trek podcast, stumbled upon the original silicone molds used to create the Nubbin bug while a listener found in a warehouse clearance sale in Van Nuys, California.
The podcasters acquired the mold. Shortly after, a listener from Atlanta who works at a prop studio offered to help preserve the prop since the original rubber material would decay over time. This led to the creation of archival-quality plaster casts to preserve the iconic alien for generations to come.
And they did some more, using 3D scanners – the Nubbin bug was recreated as a 3D model, allowing for exact replicas to be printed. Over 100 of these replicas were made, each one hand-painted and assembled to match the original as closely as possible. Their handmade / 3D-printed versions look almost identical to the bugs that appeared in the episode.