“Marvel’s Agents of S.H.I.E.L.D.” Season 2, episode 12, brought on another familiar face. Thor’s friend Lady Sif (Jaimie Alexander) returned to the show. Unfortunately, she didn’t bring her memory with her. While Skye (Chloe Bennet) tried to help the team figure out what happened to Sif, the Inhuman realized that she still couldn’t control her new powers.

Lady Sif showed up on a beach looking for someone. Unfortunately, she couldn’t remember much of anything else -- including her identity. Authorities in Portugal picked her up, and they called in S.H.I.E.L.D. Coulson (Clark Gregg) and May (Ming-Na Wen) came to her aid, and they had to figure out why she was sent to Earth.

Skye found a video on Twitter of Sif fighting a man (Eddie McClintok) on a pier. He used a tool to hit her in the chest and she went over the side of the pier into the ocean. Although he looked human, his hunt for nitrogen at the hospital showed that he could turn blue. He was one of the Kree.

Skye and Bobbi (Adrianne Palicki) went to the hospital and found a woman who couldn’t remember her identity. Once they learned that their Kree suspect needed nitrogen, they found him in the hospital. He used the nitrogen to turn his skin from blue back to a human skin tone.

Bobbi went after him, but Skye didn’t have her emotions under control. The gun fell apart in midair and the whole room started shaking, knocking a set of shelves on herself. The Kree criminal got away.

Simmons (Elizabeth Henstridge) informed Coulson that the science team has a new protocol in place for people with alien powers because their new technology was more powerful than ever. While the new tech didn’t kill suspects, it could bring them down very quickly. “Contain him first. Ask questions later,” she warned.

Fitz (Iain De Caestecker) thought she was being harsh, but Simmons said they couldn’t take risks. People with alien powers were too dangerous.

Coulson and May figured out the Kree man was going to the site where Whitehall (Reed Diamond) first found the obelisk in 1945. They went after him, but Skye claimed she was still injured and stayed behind. The group found the Kree with a large crate, and they cast a net over him immediately.

“I am here to help,” he claimed. He said he took Sif’s memory to keep her from tracking him. He said his name was Vin-Tak and he wasn’t there to hurt anyone. He would even give Sif her memory back. They all argued over actually letting him use his mallet-like weapon on Sif, so he eventually just did it without permission. Everyone drew their guns, but he was telling the truth. Lady Sif had her memories back.

Vin-Tak explained that he was sent to Earth because a signal was sent to his home planet. He knew that Terrigenesis had happened and humans had been genetically modified to have alien powers. He explained that these people were made by the Kree to be killers.

He wanted to destroy the new Inhumans and the obelisks that can start the Terrigenesis process. Enough obelisks to create an army were in that crate he was found with, but the crate was empty when the science team opened it.

“These creatures are weapons and abominations, even if they don’t know,” he explained.

Coulson revealed that Raina (Ruth Negga) was the one to send the signal, and he added that Skye witnessed it. Vin-Tak was immediately concerned that Skye had been transformed as well. He said that she could have been affected and not even know it.

The room started shaking, and suddenly May and Coulson realized the earthquakes weren’t a coincidence. “Skye, what’s doing this?” Coulson asked.

“I am,” Skye said before she broke the windows with her powers.

Sif wanted to take her to Asgard while Vin-Tak wanted her “eliminated.” May immediately took Skye on the run.

“You want her, you have to go through me,” Coulson said. Unfortunately, the Kree easily tossed him aside. Bobbi and Mack (Henry Simmons) came up against him next. They wondered if they should call in “backup” as Hunter (Nick Blood) arrived. Mack and Hunter were easily knocked out. Bobbi put up an impressive fight.

Fitz used Coulson’s gun from “The Avengers” (which Coulson affectionately calls “Bambino”) to get the alien down. Bobbi used his own weapon against him and took his memory away.

Meanwhile, May took Skye into a Ward’s old holding cell and tried to get her to focus. In the beginning of the episode, May tried to get Skye to control her emotions to fight and she needed that skill now more than ever. As Sif broke the barrier of the cell, Skye knocked herself out with an ICER gun.

After seeing Skye knock herself out to protect those around her, Sif agreed to let Coulson handle Skye. She would leave for Asgard and take Vin-Tak back to his home planet. She warned Coulson that he was taking on a lot. “There are tides in the universe that you cannot swim against,” she said.

Simmons confronted Fitz about Skye’s powers. She didn’t like that he was keeping secrets, but Fitz reasoned that she had been increasingly harsh on people with alien powers. He didn’t want Simmons to treat Skye differently. “Skye is my friend, she’s different,” Simmons said.

Fitz pointed out that Simmons couldn’t treat him the same after his injury. He also said he was protecting Skye from being locked up and studied. Bobbi agreed with Simmons that it wasn’t fair to the team. Fitz said that she needed to be protected.

“No Fitz, we’re the ones that need protection from her,” Mack said.

Skye heard Mack and packed a bag. She went to one of the S.H.I.E.L.D. holding cells.

Yet Skye’s future with S.H.I.E.L.D. isn’t the only concern. Hunter’s future isn’t clear either. Coulson offered to make Hunter’s position with S.H.I.E.L.D. permanent. Though he was typically a mercenary, Hunter actually wanted to stay. He knew that Bobbi’s job with S.H.I.E.L.D. broke them up the first time. “Now we’re on the same team. It’s simpler,” he said.

He didn’t realize that he was complicating things for Bobbi. Mack wanted Hunter gone. “He’ll react badly and it’ll blow up in our face…I don’t want him here in case he takes their side,” Mack said. He thought Hunter was capable of killing Bobbi if he discovered their secret mission.

We still don’t know who Bobbi and Mack are working for or what they're after. However, Bobbi said they weren’t Hydra, so it shouldn’t feel like that kind of betrayal if Hunter finds out. Still, she took Mack’s advice. As she looked over the Kree weapon, she told Hunter that she needed to slow their relationship down. Hunter noted that usually they got a little farther into their relationship before this happened.

Hunter knew that something bigger was going on. He confronted Mack about his suspicions. “I know about the flash drive,” Hunter said. “I know Coulson doesn’t know about it, but I bet he’d like to. I know there’s no support group ... Who is 'backup'?”

Mack decided that he had to choke Hunter and left him unconscious on the ground.

“Marvel’s Agents of S.H.I.E.L.D.” Season 2 airs Tuesdays at 9 p.m. EDT on ABC. Who do you think Bobbi and Mack work for? Sound off in the comments section below!