From daytime to primetime.

Sarah Brown announced on Twitter yesterday that she would be appearing on an upcoming episode of Castle. The actress is best known for her long-running stint on General Hospital, which came to an end this year when she joined the cast of The Bold and the Beautiful.

Not much is known about her role at the moment, but wrote Brown:

The ABC series stars Nathan Fillion as the title character. The actor possesses soap opera roots of his own, as his first big break came on One Life to Live.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.