Not since the pilot episode — “The Vulcan Hello” — have Starfleet officers beamed down to a strange, new world on Star Trek: Discovery. But in the forthcoming eight episode, “Si Vis Pacem, Para Bellum,” that changes as Burnham, Tyler and Saru beam down to the planet Pahvo in classic Trek fashion. And from the looks of the new trailer, this episode is going to contain a few big reveals, and maybe even one major death.

On Thursday, CBS released the trailer for episode 8 of Star Trek: Discovery. The title roughly translated from Latin means “If you want peace, prepare for war.” In terms of big season long-mysteries, there are at least two things of note. First, it looks like Lt. Tyler will be reunited with his Klingon captor from “Choose Your Pain. Also, we briefly see Admiral Cornwell in Klingon captivity, which suggests something with her storyline will change in a big way.

Captain Lorca also ominously says “there will be time to grieve” which implies someone is going to die. Could it be Cornwell? A reference to Tyler being possibly revealed as a double agent? Or maybe Lt. Saru? Because after merging with some crazy blue energy, it appears that the formerly fearful Kelpien first officer has some confident mojo. Too confident?

With “Si Vis Pacem, Para Bellum,” it seems like at least one big twist — maybe the Mirror Universe — will finally happen.

All the more reason to catch Star Trek: Discovery this Sunday at 8:30 pm eastern time on CBS All-Access. And remember, after this, there’s only one more episode before the mid-season break!

Read Next: Is Admiral Cornwell Secretly an Original Series Character?

If you liked this article, check out this video of a terrifying theory about Star Trek transporters.