[DISCUSSION] Star Trek: Strange New Worlds - S02E09 Subspace Rhapsody (Spoilers)
Premise:
An accident with an experimental quantum probability field causes everyone on the Enterprise to break uncontrollably into song, but the real danger is that the field is expanding & beginning to impact other ships - allies & enemies alike.
I don't even like musicals but this was a totally unexcepted surprise and they played it in a spectacular way. I would rate this definitely as one of the best episodes of star trek.