It's going to be tough to top "4,722 Hours," last week's excellent Agents of S.H.I.E.L.D. near-bottle episode that finally showed what exactly happened to Jemma Simmons during the six months after she was sucked into the monolith. After fighting to survive on a very inhospitable planet, she discovers she is not alone, and literally falls into a trap set by Will Daniels, a mysterious astronaut and the only other person in that dangerous new world. Jemma and Will get off to a rough start but eventually form a partnership, working together to survive. Naturally, it evolves into a romance as the two settle into a state of, well, not exactly domestic bliss, but some form of happiness. Since this is the first time we've seen him, it should've come as no surprise when at the end of the episode, Agents of S.H.I.E.L.D. revealed that Will is still on the alien planet.
That might sound dark, but I just cannot imagine a happy ending for Will that would also make sense on Agents of S.H.I.E.L.D. He's been stuck on that planet for over a decade, and knows the alien force better than anyone else. He once said that the planet has moods, and the landscape changed every time they were close to escaping. Whatever this planet is, it seems sentient and intent on keeping Will around. Maybe it's frustrated it got to all of his astronaut colleagues, but never managed to get inside Will's head.
So, the portal is death, the planet is death, and the planet is hunting Will. This seems like a recipe for disaster. Even if they do manage to bring back Will himself, he may have already gone insane the same way his team did. I cannot think of anything worse than Jemma and Will reuniting, only to have him be evil, but that may be exactly what is coming on Agents of S.H.I.E.L.D.