Agents of SHIELD's midseason finale is building up to a big reveal, but fans shouldn't expect to see the mystery of the alien city completely wrapped up.

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That doesn't mean Tuesdays "...Ye Who Enter Here" and Dec. 9's "What They Become" won't hold a major payoff for fans. Just don't expect every plotline to come twining together and tie up in a nice little bow before the holidays.

"I think we feel pretty confident that what we're building to is cool! We think it's cool, we hope people think it's cool!" teased executive producer Jeff Bell, according to Newsarama. "Beyond that, it's not a final, final - we're not revealing every secret of the island here, it's not the payoff of just one central question, it's "we have a cool reveal coming up," and after that, we're only halfway through Season 2. So we have many more cool reveals that we hope will lead to many more cool questions."

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Coulson's team will head to Puerto Rico in "...Ye Who Enter Here" in orer to find the entrance to the underground city, and once they get there, the Director plans to annihilate the temple. It remains to be seen if SHIELD will accomplish this task, particularly since the underground agency will have to face off with HYDRA in "What They Become."

What ever the endgame, Bell promises fans reactions will be along the lines of "Holy sh-t, I have to come back and see the second half."

Find out more when Agents of SHIELD airs Tuesdays at 9 p.m. ET on ABC. Click the video below to see a preview for "...Ye Who Enter Here."

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Marvel's Agents of S.H.I.E.L.D., Television, ABC, Marvel