[6] Trapped on the ocean floor, Fitz and Simmons send out a distress signal, and devise a controlled explosive to blow the windows open and escape.

Fitz forces a distraught Simmons to take the sole oxygen tank, professing his feelings for her.

He is nearly drowned after using the explosive, while Simmons swims to the surface with his unconscious body, where they are rescued by Nick Fury, who picked up their distress signal.

[10] Near the end of the season, as Fitz arranges for a date with Simmons, a Kree weapon called the "Monolith", which is in S.H.I.E.L.D.

[13] Simmons struggles to readjust to being back on Earth,[14] and tells Fitz about the 4,722 hours she spent stranded on the desert planet.

Simmons tracks down Coulson but is unable to convince him that this world is fake and he calls Hydra on her which she narrowly escapes.

and transports them to a space station in the future, except Fitz,[20] who joins them later through the Chronicom Enoch's spaceship after being in stasis for 74 years.

[26] For Fitz's safety, Simmons surrenders herself to Atarah, Enoch's former superior, so that the two of them can come up with a time-traveling method that the Chronicoms intend to use.

[27] Atarah traps Fitz and Simmons inside their own minds, forcing them to work together in figuring out time travel logic.

The trio then teleport away,[28] but end up again on Kitson, where Fitz and Simmons are saved from execution by Izel, who helps them on their return to Earth while Enoch bids them farewell.

[32] Along the way, Deke discovers that Simmons has a memory implant that blocks her knowledge of Fitz's location while retaining information on time travel.

However, an impatient Malick unwittingly ruins the plan when he sends his acolyte Kora to attack Simmons' rescuers, who ultimately allows them to escape.

safehouse, Simmons subconsciously builds a portal device that brings Fitz to them despite her damaged memory.

[36] While returning to their timeline and helping to restore her memory, Fitz helps Simmons remember that Enoch took them away so they could build a time machine and that they had a daughter named Alya before returning to their friends Flint and Piper and asking them to guard Fitz and Alya while Simmons left with the team.

She's young and hungry and she's a great woman to play because she's intelligent and focused and curious and she doesn't apologize for it.

"[39] After the reveal during the season two premiere that Fitz was just imagining Simmons in the episode, Henstridge explained that the showrunners "tell you what you need to know to act your scenes, but anything after that, you never know.

"[40] For Simmons' costume design, Foley tried to have her clothes reflect her personality, without "getting too cliché...we mix the hard with the soft—we combine the feminine elements like peter pan collars, silk blouses and florals with the masculine touches like ties".

"[38] Talking about the harsher side of Simmons seen later in the second season, after the reveal of the Inhumans and the subsequent death of Agent Triplett, Henstridge explained that at the beginning of the series, Simmons was "very mathematical" but throughout the first season "understood that it was more about human relationships and what it means to save someone's life".

[38] After Simmons is trapped on the planet Maveth for six months, she becomes "profoundly different", with Henstridge describing her as "definitely still her essence—she doesn't just completely change.

"[44] Describing the relationship that Simmons develops with Daniels on the planet, and comparing it to that with Fitz, Henstridge said, "It's very visceral.

"[45] After Daniels dies and Simmons eventually moves on with Fitz, the latter two are shown consummating their relationship after several seasons worth of build up.

So moving forward, while this change in their friendship would hopefully only deepen their connection, it is bound also to make things a bit more complicated.