Fans of Agents of S.H.I.E.L.D. can finally breathe a sigh of relief following the fifth season finale, as it won't be the end for various characters we've come to know and love over the years. Though a sixth season is now on the horizon for the summer of 2019, it wasn't a sure thing when season five kicked off. This resulted in the show's creators shaping these episodes to serve as a true end, should the show not be renewed. In the process we've got a few loose ends tied up by bringing back a number of long missing characters like Deathlok, Ian Quinn, Lance Hunter, and Graviton.
That said, not every living character still out there from the show's run came back, and if season six ends up being the last hurrah, it would be the perfect opportunity to give a few absent faces the chance for their own encore.
From a villain who deserves to get what's coming to him to an Inhuman whose fate has been left hanging for far too long, these characters - all of whom have been missing since the fourth season or earlier - deserve to reemerge from the shadows.