Research adviser is trying to give my thesis to another student. What to do? Going to sound dramatic, but something just isn't right about my research adviser who is trying to give my research to another student.  I don't know the student at all, but they are attempting to force me into a "partnership" with them.  The student has zero research accomplishments in my research area, but I've been told to tack them onto my research and share a years worth of findings with them.  Yes, really.  What would you do? Have you even heard of something like this before?
What would I do?

Mentor the guy, get him involved in my project, train him up. If you're as experienced as you claim, and he's as inexperienced as you think, you've got nothing to worry about except the time investment it will take to get him up to speed.

Have I heard of something like this before?

Yes, it's absolutely normal. Your research advisor is paying you a compliment -- she obviously thinks you're ready to mentor someone more junior. As someone who supervises more than one person, she's probably also planning for the future -- when you leave ultimately, someone will need to understand your work so that others in the group can build on it (this is a plus for you, in that you'll hopefully get citations).

There's absolutely no mileage in being melodramatic or defensive about your work. If someone were trying to take credit for stuff you'd done, that would be one thing (and there are ways of dealing with that), but in this case it's nothing of the kind -- you've been asked to mentor a more junior student, and the right way of looking at it is as an opportunity.