'Supersymmetry' Story Code '4ADH05' by Elizabeth Craft and Sarah Fain

After Fred's physics article is published; she's invited to speak at a symposium where a portal opens, bringing her face to face with a demon and a dark secret about her old professor. Meanwhile, Angel tries to solve the mystery of the portal and why someone would want Fred out of the way.

David Boreanaz (Angel), Charisma Carpenter (Cordelia Chase), Alexis Denisof (Wesley Wyndam-Price), J. August Richards (Charles Gunn), Amy Acker (Winifred ‘Fred’ Burkle), Vincent Kartheiser (Connor), Andy Hallett (Host [Lorne]), Stephanie Romanov (Lilah Morgan), Randy Oglesby (Professor Oliver Seidel), Jerry Trainer (Jared), Jennifer Hipp (Laurie)
Directed by Bill L. Norton

TX (US): 3rd November 2002

Notes:
*Featuring Angel, Cordelia, Wesley, Gunn, Fred, the Host and Connor