A stranded alien with thelepatic powers contacts a student to get help getting away from the nightmarish planet she's on. At first Bob tries to ignore her, but her calls become more insistent. She offers to be his in exchange. She gets captured and is in great danger, so Bob agrees to build a teleporter on earth. He activates right in the nick of time, but gets teleported to the planet himself - which means his death. The Alien explains why they normally use spaceships: teleporters need an exchange to work. She tricked him to save her life... she seems to be sad because of that, but affirms she had to do that... it was her life against his.
[End Spoiler] There's no mind control in this one. What's seen is Thelepathy. So i'm downvoting that tag^^