'Marvel's Agents of S.H.I.E.L.D.' season 4 spoilers: Classic Inhumans to start appearing in the series, says Joss Whedon

While “Marvel’s Agents of S.H.I.E.L.D.” continues in development, several fans are already speculating about the upcoming story and characters. Executive produce Joss Whedon particularly hinted that classic Inhumans may appear in Season 4.

Spoiler alert! This article contains "Marvel’s Agents of S.H.I.E.L.D." spoilers. Read on if you would like to know what happens next before the new episode airs.

Inhumans were first introduced in “Marvel’s Agents of S.H.I.E.L.D.” Season 2. However, the ones that were featured were particularly created for the TV series, except for Daisy Johnson (Chloe Bennet). As the story progresses, classic Inhumans may appear in future episodes.

According to Io9, Jed Whedon and fellow executive producer Marissa Tancharoen were present at San Diego Comic-Con 2016, where he revealed that they have a little more freedom in “Marvel’s Agents of S.H.I.E.L.D” Season 5. They plan to return the focus on Inhumans, where they can do more about the characters. Ghost Rider, the show’s biggest new character yet, was previously announced to join the storyline.

Whedon explained that the Marvel approach is that magic is actually science that they do not fully understand. They will introduce both magical elements and very hardcore science in “Marvel’s Agents of S.H.I.E.L.D.” in the next episodes.

ComicBookResources did not share who the classic Inhumans in “Marvel’s Agents of S.H.I.E.L.D.” Season 4 will be, the executive producers may showcase the Inhuman royal family, who initially appeared in “Fantastic Four #45” by Stan Lee and Jack Kirby. The family features a whole race of genetically modified Kree-human hybrids. Some of the royal family members include Black Bolt, Medusa, Crystal, Gorgon and Karnak.

Science Fiction writes that budget constraints may not allow the King and Queen of Attilan to encounter Phil Coulson and the team, but it is more possible for Crystal to appear, since her powers and costume will not require as much CGI enhancement and make-up. If Crystal appears, Lockjaw may also be featured soon. Overall, “Marvel’s Agents of S.H.I.E.L.D.” is expected to provide a number of alterations from the source material to suit the storyline as well as the direction that the Marvel Cinematic Universe is headed into.

“Marvel’s Agents of S.H.I.E.L.D.” Season 4 is set to premiere on September 20, 2016 on ABC. It also airs on Channel Seven in Australia. More updates and details are expected soon.