The Star Trek galaxy is home to many unknowns, mysteries and some of them are from scary episodes such as the creatures from Schisms or the Borg themselves. Let's take a look at 5 such unresolved plots that are not picked up again in the canon of the shows.

Star Trek Online developed by Cryptic Studios and Perfect World.
Star Trek Picard/Strange New Worlds/Lower Decks/Enterprise/Voyager/Deep Space Nine/Discovery and The Next Generation are all owned by Paramount Pictures/CBS and distributed by CBS.
This Video is for critical purposes with commentary.