Marvel: D23 debuts new scenes for 'Thor' and 'Captain America' sequels

Natalie Portman is not feeling well.

Those who have followed the footage and trailers released from this November’s sequel know that the Oscar-winner’s Jane Foster is taken by Thor from Earth back to his homeworld of Asgard, but until now we haven’t known exactly why.

According to new scenes showcased by Marvel Studios at Disney’s D23 fan convention, it turns out she’s infected.

A mysterious energy has taken possession of her body, and although her mind remains the same, her body is now something more than radioactive.

In new footage previewed at D23, a cluster of jittery, frightened British cops approach a disheveled Jane as she clings to Chris Hemsworth’s Thor. “Step back, she’s dangerous!” one cop shouts.

“So am I,” Thor replies, triggering an energy beam that takes her back to his celestial realm.

There we see Foster laid out on a glowing table while medieval-looking doctors operating futuristic, holographic scanning devices examine her. “Is that a quantum field generator?” Foster asks.

The doctor says it is not.

“Does it transfer molecular energy from one place to another?” Foster, the astrophysicist, asks her examiner, who nods. She smiles to Thor: “It’s a quantum field generator.”

Anthony Hopkins’ one-eyed ruler Odin enters the room, furious that his son brought the human to their kingdom. “She does not belong here in Asgard any more than a goat belongs at a banquet table,” he shouts.

Portman, of course, disputes the notion that she is a goat.

Odin replies that he knows who she is. “Jane Foster.”

Portman beams. “You told your dad about me!?”

But there’s no levity from Thor. “Something is in her, father, something I have not seen before.”

Odin is unmoved. He suggests dispatching her back to Earth so human doctors can deal with the problem. But as guards seize her, a blast emanates from her skin and throws them across the room.

What exactly is infecting Jane? We don’t know. Count on it being the fault of the main villain Christopher Eccleston’s Malekith the Accursed, who is scheming to tear apart the fabric of reality.

Portman, Hopkins, and Tom Hiddleston (who returns as Loki) appeared at D23 to show off the footage.

Hiddleston, who appeared at Comic-Con in a much-heralded appearance in-character as the sinister Loki, told the audience: “I didn’t bring the costume, but I did bring some friends of mine.”

Portman and Hopkins then emerged to take a bow, with a standing O for Odin from the thousands of attendees.

Marvel Studios president Kevin Feige told Portman: “In the first movie, Thor came down to Earth, and he was a fish out of water. In this new one, you’re the fish out of water.”

“Yeah, I���m the one walking around in sweatpants,” she said.

Asked how he felt about her venturing to his home world, Hopkins joked: “I didn’t check her passport.”

CAPTAIN AMERICA: THE WINTER SOLDIER

Hey, Captain America — you just helped beat back an alien menace in The Avengers, where are you going now?

The answer: He’s going to Disneyland.

Standing before a crowd of thousands at the convention center in Anaheim, Calif., Feige asked star Chris Evans, “What did you do just before we started filming?”

He noted that they hadn’t prepared this, so he hoped Evans had the right answer.

Evans winced, and doubled over slightly. “I … don’t have the right answer,” he said.

“I’ll give you a hint,” Feige nudged him. “It’s right across the street!”

“Oh, Disneyland!” Evans shouted. So now you know how a superhero unwinds. (Presumably, he gets unlimited FastPasses.)

The banter kicked off brand-new footage from the film, out next April. Feige warned that since the film just finished shooting, the scene would feature a mix of black-and-white rough animation, and a lack of some sound effects.

It begins with a crudely animated quinjet flying through the clouds. Inside, Captain America and Scarlett Johansson’s Black Widow are strap-hanging, and making awkward conversation.

“Doing anything fun Saturday night?” she asks.

“Well, all the guys from my barbershop quartet are dead, so … ” he responds.

As Cap prepares to skydive from the plane, wearing his gray-scale stealth uniform, she says bluntly: “If you asked Kristen out from statistics, she would probably say yes.”

This is a subject for which Cap has no shield. He prepares to dive.

“Too shy or too scared?” Black Widow asks.

“Too busy,” he says, plunging from the back of the quinjet.

Frank Grillo, playing the S.H.I.E.L.D. operative Crossbones, notes that he fell with no parachute. We then see rough animation of Cap swandiving thousands of feet to make an Olympics-worthy plunge into the ocean beside a cargo ship, loaded with menacing men carrying machine guns.

Cap climbs aboard via the anchor chain, and begins silently taking out the mercenaries, ninja-style, the only sound the clanging of his shield against their craniums.

Once the bad guys are neutralized, Crossbones floats down on a parachute to take out the last one.

“Thanks,” Cap says.

“You seemed pretty helpless without me,” Grillo’s character replies.

Black Widow then lands and picks up right where she intrusively left off: “What about the nurse who lives across the hall from you? She seems nice.”

AVENGERS: AGE OF ULTRON and GUARDIANS OF THE GALAXY

D23 featured the same footage of Guardians of the Galaxy and the title teaser for Avengers: Age of Ultron that were shown a month ago at Comic-Con, but there was new, extended footage of the Cap sequel