Do it. Go back to the very start, as the Pilot episode could contain more information than you gave it credit for with the re-emergence of Morgan set to go down in Season 6. He was Rick's first contact with human life after he woke up from his coma into a broken world. Morgan became a cult-hero straight away, though the Pilot acted like a red herring. We all assumed he'd be an integral part of the plot, when in reality he left the scene immediately. Since then, Rick discovered Morgan once for a single episode, where it turned out his son Duane had died and the man was rapidly descending into madness. Now Morgan has traced the survivors' footsteps and has reached Alexandria, refresh yourself on the Rick/Morgan relationship before it restarts.