This series, since its inception, has carried the burden of including lots of tie-ins and references to the large-screen Marvel movies – a necessary component, arguably, since this show’s hero, Coulson (played by Clark Gregg), was killed in one of those movies, and brought back to life to star on this TV spinoff. Last week, the seemingly big threat to the universe – Ruby, having evolved into the unstable Destroyer of Worlds – was killed, rather brutally, by S.H.I.E.L.D. agent YoYo. So things are good, right? Wrong. Because the time loop our heroes are in still has the world in peril – and with a new Avengers movie released in theaters this very day, the crossover plot points are bound to be hard to follow, if not hard to swallow.