Our friends at CBS All Access say this about the new adventure:
When a lightning storm in space scares a young Michael Burnham, her father aims to ease her fears with a mythical story about a brave little girl who faced her own fears head on.
Check out the trailer:
As you can see, this episode features some of the great moments from the Enterprise‘s past, and not necessarily the Discovery‘s present (or future).
Short Treks are mini-episodes of Trek that are released in between seasons of Discovery (and possibly the upcoming Picard) to keep viewers interested in CBS All Access.