I know it was a monster-of-the-week format, but this episode really stuck with me. Created sentient life to never be discussed again. Data is only special in that he has a physical body.

Stuck on a shelf somewhere, oblivious to the fact that it's in a simulated environment. It'd be an interesting Star Trek II type followup when someone finds the cube and plugs in a cable only to have Moriarty escape and find a mobile emitter prototype somewhere on the network.. but I digress..

For what it’s worth, Moriarity does show up again in Star Trek Picard, but only as a brief cameo.

We just need to crack out a Tommy Gun for that.