Chuck had volunteered to test the teleporter that his colleagues were working on. They had been so far successful in teleporting inanimate objects and even animal test subjects, and even Chuck was eager to see it work for humans.
However, he was fully unprepared for the pain associated with having his body deconstructed molecule by molecule. And then there was a moment of darkness before the pain came back, only this time it was from the reconstruction, which felt longer and more painful than before. He shouted out in pain with an ear piercing scream that was remarkably high pitched.
He was a little surprised to be back in the exact place he had started -- he hadn't even teleported anywhere -- but the team quickly rushed in to make sure he was okay. He thought he was (despite the pain), until he looked down to see the body of a woman instead of his own.
They began to explain what had happened. The DNA and mind of a human were the most complicated thing they had ever tried to teleport. The buffer simply wasn't able to handle it all, and something had was going to be lost. They decided to preserve Chuck's mind, for obvious reasons. But that meant they had to construct a new body while not overloading the buffer.
They had to use bits and pieces of DNA from people in the lab. It was like splicing a brand new person together, and they didn't have time to be picky. It was sheer luck which DNA he picked up from which person in the lab, gaining two X chromosomes by pure chance from Dr. Sarah Forester or a few Asian traits from Dr. Marc Kim.
Chuck supposed he should be happy to be alive, but this was going to take some getting used to...