This episode starts back at the end of the Season 2 finale, "S.O.S. Part 2," where we see Simmons sucked into the monolith. And now we finally see where she has been for the last six months: marooned on a desolate planet, an unforgiving landscape where the sun never seems to rise. Plunged into eternal darkness and armed with only her phone and her wits, Simmons must find a way to survive.
Simmons calculates that she can survive for approximately 100 hours without food or water and searches the barren landscape for signs of life or water, to no avail. Finally, she stumbles on an oasis with potable water. Simmons learns how to live off the land and survive by hunting and eating carnivorous plant tendrils. To tend to her emotional health, Simmons watches a video of Fitz and the rest of the team on her phone. This video is her last remaining connection to Earth.
Cut to weeks later, Simmons falls into a hole in the ground—it’s some kind of trap! She wakes up a prisoner in a cave. A brooding Stranger watches over her.
The mysterious Stranger keeps Simmons captive for several days. Simmons tries to escape but trips and injures herself. The Stranger saves her before a sandstorm hits. The Stranger warns her that the sandstorm was caused by It, which he believes is death incarnate. Simmons doesn’t believe him, but our Stranger is certain that something evil is lurking on this planet…
Back in the cave, the Stranger introduces himself—his name is Will Daniels. He’s a former NASA pilot who was sent through the portal fourteen years ago, accompanied by a team of scientists, all of whom supposedly went mad after It got into their heads. Will has survived by staying one step ahead of It. Simmons convinces Will that they must work together to get off the planet. But can Simmons achieve the impossible?
Against Will’s advice, Simmons ventures out near the “No-Fly Zone,” to a mysterious junkyard of bones and artifacts of different time periods. Simmons sees a shadowy figure… It has returned. Simmons flees!
Simmons realizes she can use the movement of stars to track the next location of the portal. All she needs is Will’s broken star charting computer. Simmons powers the computer using the last remaining juice in her phone battery, thus losing her last connection to Fitz and home. She determines the next location and time the portal will open up. The mission: throw a message in a bottle through the portal to signal for help. Simmons and Will do find the portal …but it’s moments too late.
Will and Simmons return to the cave, crestfallen. Seeking solace in one another, they kiss. Over the following weeks, they become much more than friends.
After missing the portal, Simmons sees a flare shoot thru the sky and she knows it’s Fitz, come for her. Will and Simmons dash for the portal, but a mysterious figure dressed like an astronaut appears….It has returned. Will pushes Simmons towards the portal while he distracts It. Simmons calls out to Will, but before she can return for him, Fitz appears! Fitz rescues Simmons and pulls her back through the portal.
In the present day, Simmons finishes telling Fitz his story. He vows to help Simmons rescue Will.