The evil Terrans, in the course of wrecking up planets and junk, are sucking non-renewable energy from the mushroom network and if not stopped will suck the life out of the entire multiverse. Why, did you need higher stakes?
Gabriel "Make The Empire Glorious Again" Lorca's been a Mirror Man all along. To paraphrase Devo, Gabriel Lorca "is a man with a mission. A boy with a gun. He has a picture in his pocket of the lucky one. He is a big, big mess." He frees his ACTUAL crew including the Mirror Ellen Landry (poked a bear in episode 4, torn to shreds?) from their year-long agony booth spa day and throws them into the Emperor's cannons. Nobody who hears Lorca's tale of torpedos, transporters, ion storms and probably a mongoose bite that all converged to swap him with the (good?) Lorca a year ago survives this episode. Lorca also claims he shared a bed and coup attempt with Mirror Michael Burnham but at this point I wouldn't believe Lorca if he told me Kelpians are delicious.
And I certainly do love the taste of Saru in command! His speech to his now entirely trustworthy infiltrator-free team about ideals in the face of certain death is bitchin'.
If Michael and the Ewoks can get the shields down from the inside, Discovery can stop the evil energy orb, and as an added bonus, Paul can surf the explosion back to home base.
It's a grandiose SFX heavy firefight. I do miss Star Trek phaser beams instead of Star Wars blaster bolts- I didn’t know what universe I was watching BEFORE I didn’t know what universe I was watching.