#tbt: X-Men #20 – Jean Grey demands Psylocke to tell her if her and Cyclops are having an affair. Enraged, Psylocke uses her psi-knife on Jean and knocks her out. Suddenly, Psylocke sees an image of her previous self who turns out surprisingly real. The new arrival attacks Psylocke, and defeats her. When the rest of the X-Men arrive, the new arrival reveals herself as the original Betsy Braddock, stating that the Psylocke they know is and has been an impostor. Written by Fabian Nicieza and Art by Andy Kubert. Read full summary here.