Now that 'Game of Thrones' season 3 has begun its run, and 'The Walking Dead' has closed up shop until season 4, genre TV fans have plenty of new adventures to look forward to. ABC's 'S.H.I.E.L.D.' TV series has yet to recieve an official series order, but will likely debut this fall regardless, continuing the adventures of Agent Phil Coulson (Clark Gregg) and a new team. Yet every Marvel fan still has one major question for the series: just how will Coulson return for 'S.H.I.E.L.D.' after the events of 'The Avengers'?