Marvel has released the first clip from this week's episode of Marvel's Agents of S.H.I.E.L.D., "... Ye Who Enter Here", airing Tuesday, December 2 at 9 PM ET on ABC. This scene showcases Skye (Chloe Bennet) squaring off with a much different version of Melinda May (Ming-Na Wen), as both of their skills are put to the test. While agent will come out on top? We'll have to tune in tomorrow to find out for sure.

The previous episodes have centered on both S.H.I.E.L.D. and Hydra trying to find a mysterious city first. In tomorrow night's episode, S.H.I.E.L.D. finds the aancient city before Hydra, but uncovering the secrets may require one of Coulson's team to make the ultimate sacrifice. Meanwhile, May and Skye race to get to Raina (guest star Ruth Negga) before Whitehall takes her. As we see in the clip, Skye and Koenig (Patton Oswalt) have found Raina, but before they can lead her to safety, May's evil doppleganger strikes, putting their mission in jeopardy.

Last week, we reported that the previously mentioned "ancient city" both S.H.I.E.L.D. and Hydra are searching for may very well be Attilan, which could help set up the future Marvel Phase Three big-screen adventure Inhumans, which doesn't arrive in theaters until November 2, 2018. That hasn't been confirmed yet, but check out the clip below before tuning in tomorrow night.