If the first episode of Secret Invasion was a little slow for your tastes, then there was plenty to unpack in "Promises."
Beginning in 1997, we see the younger Nick Fury meet Gravik for the first time. He was just a child then, but managed to escape from behind Kree enemy lines after his parents were killed, piloting a ship back to Earth. He seems reluctant to trust a human, but Fury manages to bring him into the fold.
We later see Fury promise that, if the Skrulls now on Earth promise to work for him and go undercover as humans, he and Carol Danvers will do everything they can to find them a new home. Attempts to relocate them after the events of Captain Marvel failed, though we know this vow is also one Fury failed to see through.
That's not only surprising when you think back to what we saw from Fury in The Avengers (remember the HYDRA weapons he'd created behind the backs of Earth's Mightiest Heroes?), but it goes some way in explaining why Gravik hates the former S.H.I.E.L.D. Director so much.
In the present day, Fury - still distraught over Maria Hill's death - argues with Talos and learns that, after Skrullos (the Skrull homeworld) was destroyed, over a million Skrulls ended up on Earth.
This is news to Fury and it's then the extent of this invasion really sinks in. The two part ways but not before Fury points out that there's simply no way for Skrulls to co-exist with humans on Earth, particularly when we can't manage to live peacefully with each other, never mind an alien race.
Later in the episode, Gravik is chosen as the new leader of the Skrulls on Earth and Fury is fired by Rhodey. However, as he points out to War Machine, "I'm Nick Fury. Even when I'm out, I'm in."
In the closing moments, a dejected Fury returns home, and we see that there's a Skrull in his home preparing a meal in the kitchen. It turns out they're married, and back in her human form (Charlayne Woodard is credited as "Priscilla"), the two embrace and share a kiss!
However, we don't think Fury's wife has been secretly replaced as we're pretty sure this is Varra, the Skrull who introduces Fury to Gravik in the episode's opening moments...