Agents Of SHIELD Season 4: 15 Characters Who Need To Return
1. Graviton
Last Seen: Falling into and later appearing within the Gravitonium in season one's 'The Asset'.
The series set up the villainous Graviton only three episodes into its run, and even spent the rest of the season teasing his potential reemergence all the way through to its finale, which saw the previously-mentioned Ian Quinn making off with the Gravitonium containing Hall.
Unfortunately, like Quinn, we haven't heard from or seen Hall/Graviton since, with the series having dropped the season-long thread to really hone in on things like HYDRA, the Inhumans, and the impact of the Darkhold over the course of seasons two, three, and four.
With the Framework in play for the final arc of the season, it's hard to see how Graviton - who deserves to be a much bigger villain than a one-off - could fit in and be done justice, but if the show continues on, it's time for him to return and wrap up the series' biggest loose end yet once and for all.
Which characters from the show's first three seasons that have sat out its fourth would you like to see return? Let us know below!