The beginning of the show is the same with Echo going home to establish her origin, we can retell the story from hawkeye with extra details, the train robbery and ice rink fight can stay, she has the power from the comic that she also had in Hawkeye which is super sight, no magic stuff
She returns to New York to demolish the Kingpin's empire while he is recovering in Hospital but comes into conflict with Electra
Big reveal: It's just like in 2007’s New Avengers #31, by writer Brian Michael Bendis and penciler Leinil Francis Yu. Echo killed Elektra in battle, and upon death, Elektra was revealed to be a Skrull
Daredevil is there, so we can tease the start of Born again with a Mayor Fisk hint and a Muse hint
(Hank Pym, Cap, Wolverine, Black Bolt, Spiderwoman, Captain Marvel, Mockingbird, Nick Fury have all also been skrulls)