Agents Of SHIELD: 10 Characters Who Should Return In Season 4
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 and the Inhumans over the course of seasons two and three. Luckily, however, season three saw the unexpected return of the seemingly one-off Asgardian character Elliot Randolph from season one, and if that can happen, then hopefully Graviton can turn up in season four to finally pay off one of the first season's biggest setups.
Which characters from the show's first two seasons that sat out its third would you like to see return? Let us know below!