Adam B. Vary Senior Entertainment Writer SPOILER ALERT: This story discusses major plot developments in the series premiere of Marvel Studios’ “Secret Invasion,” currently streaming on Disney+. Since her first appearance as Maria Hill in 2012’s “The Avengers,” Cobie Smulders has popped into the Marvel Cinematic Universe roughly half-dozen times, racing into danger and cheating death as the hyper-competent lieutenant to Nick Fury (Samuel L. Jackson), most recently in 2019’s “Spider-Man: Far From Home.” So when Marvel started planning the Disney+ series “Secret Invasion” — about how the shape-shifting Skrulls from the 2019’s prequel film “Captain Marvel” have turned against Fury and started infiltrating all levels of human society — it made perfect sense for Maria to show up, too.