They were big. And blue.
Talbot [regarding Deke]: So, this kid’s from the future?
Coulson: Yeah. And in that future, Earth is gone and the last of humanity is enslaved by alien overlords.
Talbot: Alien… over… I should’ve stayed in my cell. You’re telling me that we got our asses handed to us by little green men?
Coulson: They were big. And blue.