Disclaimers: I own nothing from Buffy the Vampire Slayer or Marvel. I'm not Joss Whedon or Stan Lee.
Doctor Reid Richards, BKA Mister Fanastic looked at Tony Stark and Doctor Stephen Strange in shock.
"Thor's dead?" he said.
"Yes." Tony said, " I saw it myself."
Then they became aware of a warping of their dimesion. It was like if you threw a stone into a lake and it causes ripples. The warping was the ripples.
After a hour the warping spat out a young woman. She was small, about five feet and two inches in height. She had been through hell. There were cuts and bruises all over her body. She was also naked as a jaybird.
Reid and Stephen looked away but Tony kept looking at her.
"Tony, don't be a pervert. She's at least twenty years younger than you," Reid said.
"She's hot as Jennifer Walters, and she's as small as the Wasp."
"She's also as young as Monet!" Reid said.
"And she needs to be healed," Strange said.
After a few minutes she was fully healed. "Enchanced healing like Wolverine," Reid said.
"Is she a mutant?" Tony asked
"No. Her bloodtests show no sign of the X factor."
She woke up and Reid gave her a labcoat to wear. "Who are you?" she asked.
"I'm Doctor Reid Richards. They're Doctor Stephen Strange and Mister Tony Stark."
Then she looked down and saw a hammer next to her. She picked it up. "What's this?" Tony asked
"It's a troll's hammer. I slayed him and I got to keep it. I'm the only one strong enough to pick it up. My name is Buffy Summers."