"Supersymmetry" is the 5th episode of the fourth season of the American television series Angel.
Written by Elizabeth Craft and Sarah Fain and directed by Bill L. Norton, it was originally broadcast on November 3, 2002, on the WB network.
Fred's article on superstring theory is published in an academic journal, and she is asked to present it at a physics symposium by her old college professor Seidel.
Her presentation is interrupted when a dimensional portal opens and snake-like creatures emerge to kill her.
Angel had spied Lilah during the speech and at first thinks she is behind it, but she was simply keeping an eye on Wesley.
Connor arrives at the Hyperion Hotel to pick up Cordelia's things because they have decided to live together.