The quest to live forever has captured our collective imagination for centuries, from ancient texts in the time of Alexander the Great to current sci-fi movies. But as a scientist notes in the trailer for "Selfless," "Immortality has some side effects."

That proves to be quite the understatement. In the movie, Ben Kingsley plays an aging, brilliant billionaire who wants to extend his life. He's offered that chance by a scientist (Matthew Goode), who's developed a procedure that would transfer Kingsley's mind into a much younger body - that of Ryan Reynolds.

But after the seemingly successful procedure, things start to go awry (natch), as Reynolds' consciousness battles that of Kingsley's for ultimate control.

"Selfless" opens in theaters this summer.