This might seem odd, given their iconic status and popularity. Perhaps the timing just never quite worked out, or maybe SNL producers felt the shows' science fiction themes wouldn't translate well to live comedy.
However, some Star Trek actors *have* appeared on SNL in other capacities:
* Patrick Stewart appeared as a guest star in a sketch in 1993.
* William Shatner appeared in a commercial parody during a "Weekend Update" segment in 1990.
So, while no Star Trek actors have hosted, a few have graced the SNL stage in other ways! It's always possible that one of them might host in the future, though.