Meet the Kaylon
"Identity, Part 1" is the best and most involving episode of The Orville so far. That it holds that distinction and still is not enough to be called "great" (at least in my book) is perhaps a problem, but this series is still young and it occupies an admittedly odd space.
The Orville is generally too cavalier to be considered serious, yet too serious to embrace the idea of a true satire/spoof. It loves Trek far too much to lampoon it. So it occupies the land of a seriocomic homage, which can make its universe hard to accept on straightforward dramatic terms. That fact must be confronted here, where an existential threat comes off more like a really cool cinematic concept than something we truly believe.