I don't watch Agents of S.H.I.E.L.D., although I've been meaning to catch up since I hear the show gets better.  I also know that recently the show made a big plot move by revealing that Skye (Chloe Bennet) is an Inhuman, which will have major ramifications with regards to the Marvel Cinematic Universe.  And now Agents of S.H.I.E.L.D. is going to delve further into understanding the Inhumans.

Marvel has announced that Luke Mitchell (The Tomorrow People) has joined the cast to play "a charismatic Inhuman named Lincoln, who has an important role to play in Skye understanding the true extent of her transformation."

Per Marvel's website:

“With the revelations surrounding Skye’s true identity in the Winter Finale, we knew we’d be introducing more Inhumans as our story progressed,” said Executive Producer and Marvel’s Head of Marvel Television, Jeph Loeb. “The charming energy Luke brings to the role will make him a character to watch as we continue our season.”

It's becoming clear that the Inhumans are going to be Marvel's way of getting around the fact that they don't own the screen rights to X-Men, and therefore no one is allowed to be a "mutant".  The solution is to go to a more obscure property—one which will get a movie on November 2, 2018 (mark you calendars!)—that shows people who have innate superpowers as opposed to something created by science or being an extraterrestrial.  I wouldn't surprised if Avengers: Age of Ultron tells us that Scarlet Witch (Elizabeth Olsen) and Quicksilver (Aaron Taylor-Johnson) are Inhumans.  That information needs to get out to more than just people who watch Agents of S.H.I.E.L.D.

I've been told by multiple people that Agents of S.H.I.E.L.D. gets much better in season two, and hopefully the addition of Mitchell will continue to make the show a genuinely good program as opposed to a series that coasts on the Marvel brand.