One episode left before Agents of S.H.I.E.L.D. goes on hiatus. That means it's time to discuss some theories - both plausible and completely off the wall! Let's go!
Theory 1: The Doctor is Mr. Hyde and Skye is Daisy Johnson. It has been pointed out that it is entirely within the realm of possibility that Skye is Daisy Johnson, Mr. Hyde's daughter. The Doctor appears to have some superpowers and a big temper (plus the whole "Mr. Hyde was a doctor, too" thing) and in Skye's dream, the song "Daisy Bell" plays. All in all, I'd grade this theory a solid A.
Theory 2: Skye and Raina are Inhumans. Well, we've already established the Kree, so this is a pretty good bet. I'd grade this an A+.
Theory 3: The underground city is Attilan. Well, this one is trickier. I'm guessing since it's, you know, underground, it's not Attilan, but a completely different Kree city. And they will save the real Attilan for the Inhumans movie. So it's possible. So I will grade this as B-.
Theory 4: Mockingbird and Mack are part of Hydra. Boo. F-.
Theory 5: Mockingbird and Mack are part of SWORD. Eh, slightly better. Still, who would be running SWORD? Abigail Brand? Wait, if they bring in Abigail Brand, I will lOSE MY SHIT YES. Theory grade: A+++
Theory 6: Mockingbird and Mack are part of the Secret Avengers. Probably more plausible. Might result in some Avenger's cameos. Theory grade: B+.
Theory 7: Fitz will turn into MODOK. I don't want this to happen, but some people say plausible. Maaaaaybe. Grade: C+.
Theory 8: Harrison Wells is actually Metron of the New Gods. Sorry wrong show.
So what are your theories?