The Rescue of Jemma Simmons was a successful research and extraction mission undertaken by S.H.I.E.L.D. to learn the secrets of the Monolith and use it to locate Jemma Simmons and transport her back to Earth.
Although Alphonso Mackenzie forbade anyone from opening it, Leo Fitz inadvertently loosened the lock while asking Jemma Simmons on a date. After Fitz left the room, the Monolith turned into liquid form and transported Simmons to the planet Maveth.
Looking for Answers
After the disappearance of Simmons, Fitz was the only one at the Playground who was firmly convinced that her friend was not dead. He then learned about a scroll which could explain the function of the Monolith and then tell him where Simmons was. Fitz tracked down the criminal Yusef Hadad in Morocco, since he was supposed to be in possession of the scroll. Fitz offered a suitcase of Splinter Bombs in exchange for the scroll, but the bombs were actually flash grenades. One of them was activated by Hadad, and Fitz seized the opportunity to flee with the scroll.
However, it soon appeared that the scroll was not helpful since it only displayed a Hebrew word, "Maveth", which once translated meant "Death". Refusing to accept that Simmons had died, Fitz rushed to the Monolith and screamed at it, demanding that it did something. He was pulled out of the box by his colleagues, before discovering that Fitz had some sand on his cheek. The sand was dated one billion years older than Earth, indicating that it originated from another planet.
S.H.I.E.L.D. enlisted the help of Pr. Randolph since he had experience with traveling between different planets. When showed the symbol "Maveth", Randolph recognized it and informed S.H.I.E.L.D. that he had already seen this symbol in a castle in Gloucestershire, England. The team went to the castle and soon found a room with an ancient but sophisticated machinery and a hole that seemed designed to host the Monolith. Phil Coulson then ordered to bring the Monolith to the castle in order to open the portal.
Opening the Portal
After setting the equipment ready and placing the Monolith into the hole, the S.H.I.E.L.D. team activated the portal. After turning on the machine, the whole room began to vibrate, causing great pain for Daisy Johnson but also turning the Monolith into liquid form. Fitz shot with a flare gun through the liquid, confirming that the portal towards the mysterious planet was opened. However, before being able to conduct further experiments, the S.H.I.E.L.D. team saw that the portal had closed.
Daisy Johnson agreed to use her powers to generate new vibrations so that the portal could be opened again. Phil Coulson and Bobbi Morse prepared to drop a video feed through the portal, but before they could send it to Maveth, Leo Fitz tied himself to a rope and jumped through the portal to rescue his friend that he had desperately searched for. 
On Maveth, Jemma Simmons, who had planned to watch the sunrise with Will Daniels, had seen the flare shot by Fitz through the portal. Simmons and Daniels rushed to the portal in order to go back to Earth, but they were ambushed by It. Daniels urged Simmons to go to the portal while he stayed behind to hold It back. Simmons ran and heard Fitz calling her name. She responded and finally found his friend. She grabbed his hand, but due to the violent winds blowing on Maveth, the two were briefly separated. On Earth, Johnson had trouble keeping the portal opened, so the S.H.I.E.L.D. team decide to pull Fitz back. Fortunately, Simmons managed to grab Fitz's hand again and the two friends were brought back to Earth just before the Monolith was destroyed.
Worried, the rest of the S.H.I.E.L.D. team looked into the hole filled with black dust. Fitz soon emerged from the remains of the Monolith and cleared the debris under which Simmons was. Simmons, very weak but much alive, whispered the name of his friend before falling on his shoulder. Fitz hugged Simmons and watched with extreme joy at his friends. Aboard the Zephyr One, Simmons was examined and showed no trace of radiation or infection. She was brought back to the Playground, where Fitz and her other friends could help her after her six-month stay on a distant planet.
Following the harsh events that Jemma Simmons had lived on Maveth, especially the isolation and the fear of It, Simmons experienced some nightmares which made her think she was back on the devastated planet. Fortunately, the presence of her friend Leo Fitz beside her helped her to relax and find comfort.
The vibrations generated by Daisy Johnson caused the destruction of the Monolith, seemingly preventing anyone to use it again to reach Maveth. However, Simmons was determined to find a way to use the Monolith remnants to go back to Maveth in order to bring back Will Daniels, with whom she had bonded over time and after losing all hope to return on Earth. However, even with Fitz's help, she couldn't use them. Another portal to Maveth was finally opened by Gideon Malick using the Monolith fragments that HYDRA had in its possession.
An Incredible Deed
The rescue of Jemma Simmons deeply impressed the S.H.I.E.L.D. agents who took part in it or who were told the story, both because of the fact that it briefly connected Earth with another planet and because it demonstrated to what extent Leo Fitz was willing to risk his life to save the person he loved. Thus, the rescue of Jemma Simmons was referred to on several occasions, for instance by Daisy Johnson. Jemma Simmons herself, while struggling with her feelings for Will Daniels and Fitz, acknowledged that the latter had done something extraordinary for her. Even Holden Radcliffe, who had no part in S.H.I.E.L.D. at the time, was impressed by the story and tried to have Fitz remember it when they were stuck in the Framework.
- ↑ Agents of S.H.I.E.L.D.: 3.05: 4,722 Hours
- ↑ Agents of S.H.I.E.L.D.: 2.22: S.O.S. Part Two
- ↑ Agents of S.H.I.E.L.D.: 3.01: Laws of Nature
- ↑ 4.0 4.1 4.2 Agents of S.H.I.E.L.D.: 3.02: Purpose in the Machine
- ↑ Agents of S.H.I.E.L.D.: 3.03: 4,722 Hours
- ↑ Agents of S.H.I.E.L.D.: 3.09: Closure
- ↑ Agents of S.H.I.E.L.D.: 4.07: Deals With Our Devils
- ↑ Agents of S.H.I.E.L.D.: 3.08: Many Heads, One Tale
- ↑ Agents of S.H.I.E.L.D.: 4.17: Identity and Change