Their hidden genes could be activated by a thing called terrigen mist that makes them inhumans but not all get powers. Some might devolve too, so this terrigen mist is sometimes dangerous to inhumans too. For normal humans being exposed to terrigen mist is a death sentence.

Skye was exposed to the terrigen mist and thus became an inhuman.

"What is the problem?" John asked as he needed to fake himself a bit now. Coulson then narrated the story of their mission in Puerto Rico and Skye being exposed to a weird mist and her being inside a cocoon. After she came out, her genes changed a lot and now they didn't know what to do with Skye.

She had powers now, but she couldn't control them. John listened to everything and looked at Skye.

"Skye, do you have anxiety with these new powers?" John asked.

"I have no control of my powers and I feel I am a liability to the team. Fitz said my genes have changed. Aang has powers but his genes are exactly the same as a human being, why is that my genes changed when I got powers." Skye replied.

"Hmm... I understand." John said. Then he proceeded to wear the helmet of Fate. "Avengers, we have a mission. Fury, bring the weird artefact that you got at the house of Gideon Mallick." John said in a loud tone. He used his telepathy to call all the Avengers at the Hall of Justice and called Fury too.

"Huh. Is the matter serious?" Coulson said as he understood that John called the Avengers, but he didn't understand why.

"Is there a problem with Skye?" Coulson asked again as Skye was his subordinate and didn't want anything to happen to her.

"She is fine. I will explain the problem or rather the gift of her in the meeting. You all are welcome to join the meeting of the Avengers. I will explain everything there. The mission is something else. I have not dealt with a being for a long time. It is time I end the problem."

Skye and others were relieved when John said that, they thought Skye was a problem and needed to be dealt with. They all went to the Hall of Justice and all the new people were excited. They have all heard about the Hall of Justice but this time they got to see it and even attend a meeting of the Avengers, Earth's mightiest heroes.

All came in when John called, and Fury came with a few agents carrying a huge glass box. There was a huge block of rock inside it. But what was weird was that the rock sometimes became a liquid for a few seconds and returned back to its shape.

All were confused by such weird behavior of the rock and all looked at John who showed up with Coulson and his team.

"What is this new freak thing about?" Tony asked.

"We got the box when we raided the house of Mallick after Hydra was purged. SHIELD did everything to find the origin of it but we failed to find any information from it." Wayne said as he was the Secretary, knew all about the artifacts and things of SHIELD.

"So what now? Do we face danger?" Mera asked.

"Not exactly, we will go and knock on the doors of danger this time." John said. Then he proceeded to tell the story of Inhumans and their experiments thousands of years ago.

"So when you mentioned Black Bolt last time as the King of Inhumans, did you mean there is a special race of people among us?" Banner asked.

"No. In this universe there are no such races. Well, as a matter of fact there is a hidden race but it isn't as large as the race in other universes. Today we have a member of that race. Skye, come here." John said. Skye now understood what her heritage was and that she was an inhuman. She walked towards John while her body was trembling.

"Don't be nervous Skye, there is nothing wrong. You just got powers that people can only dream about." John said.

"She is Skye, an inhuman. Her power is related to vibrations. Her name in another universe is Quake. She can make vibrations around herself and is immensely powerful." John said.

All looked at Skye with curiosity now. Getting all the looks from all the Avengers made her shy, and she kept her head low as she didn't know to react.

"So what now, do you want to integrate her with the Avengers?" Victor asked.

"That is her choice, if she wants to join, she is welcome but if she wants to continue with Coulson then it's up to her. But I didn't just call you all to introduce her. I called you all to kill an enemy." John said.

(Yes I know there was an Inhumans series but Marvel recently did a soft reboot of the series and thus the Inhumans series reportedly never happened in the MCU, so there is no Black Bolt in the current MCU, at least that's what I am going with now.)