As spoiled as we are these days with so many Marvel live-action series, it's hard to imagine a time when there weren't any at all. Now we have a wide array of Marvel shows, spanning different networks and streaming services, telling self-contained stories or sharing universes with each other and the MCU as a whole. But it could be said they all owe a debt to Agents of S.H.I.E.L.D. the one that started it all way back in 2013, when it launched on ABC. The first and longest running Marvel TV …