The premise is rather simple - Agent Coulson (a fan favorite from the Marvel movies) is resurrected and tasked with forming a team to go on missions for S.H.I.E.L.D.. At the beginning they focus on a monster of the week kind of show where small hints of an overall story arc are dropped (Coulson's resurrection and the origins of a team member). Over time the focus then shifts more on these mysteries and also has a very well executed tie-in with Marvel's Captain America the Winter Soldier. From a perspective of a Marvel movie fan this show is a very good addition of the universe to bring some parts of it to the small screen. If you're not a Marvel movie fan then it's still an interesting spy-fi show but you may find it difficult to understand all the references and name dropping the show uses to cater to its fans.