Carolyn Hinsey, who is an editor for "Soap Opera Weekly", wrote this in Friday's New York Daily News:
A blackout hits Springfield next week on 'Guiding Light' (CBS, 10 a.m.), but look closely. When the lights go out, Cassie will be played by Laura Wright, who has jumped ship to play Carly on 'General Hospital.' When they come back on, Cassie will be portrayed by newcomer Nicole Forester.
Obviously, within the framework of the show's inner reality, the blackout is somehow connected with this recastaway. I suspect an alien abduction; something along the lines of the alien impregnation of a town's female population in "Children Of The Damned".
The alien Cassie will be able to project the aura of the original Cassie using technology similar to that of the Quantum Leap system; so that people looking at her will not be able to tell the difference. But the audience viewing at home will be able to see the new Cassie.
Whatever her reason for being here in Springfield, the new Cassie will never give herself away to any of the others on the show. For all that we see of her on screen, Cassie will continue Life as if she were the real deal.
That would be my splainin, anyway.