Admiral grey beard used to be the mummy.
what if they're all hologramsMan I hate to keep complaining but I remembered something else. Last week's big twist was that Earth has left the Federation. This week Disco finds Starfleet's secret base...and everyone there is human. I get that not all humans would live on Earth, but it seems like they could have had an all alien Starfleet and that would have been something cool and different?