PENNY IS INVITED TO APPEAR AT A LOCAL COMIC CON FOR HER ROLE IN "SERIAL APE-IST," AND LEONARD CONVINCES HER TO ATTEND, WHEN "THE BIG BANG THEORY" MOVES TO ITS REGULAR TIME PERIOD, THURSDAY, OCT. 27, AT 8:00 PM

Editor's note: The air time of this episode has changed.

"The Fetal Kick Catalyst" - Penny is surprised to learn she has fans of her performance in "Serial Ape-ist" when she attends Van Nuys Comic Con with Leonard. Also, Amy hosts a Sheldon-style brunch at Penny's apartment, and Wolowitz makes an impulsive purchase when he starts stressing out about the baby on the way, when THE BIG BANG THEORY moves to its regular time period, Thursday, Oct. 27 (8:00-8:30 PM, ET/PT), on the CBS Television Network.

REGULAR CAST:

Johnny Galecki (Leonard)
Jim Parsons (Sheldon)
Kaley Cuoco (Penny)
Simon Helberg (Wolowitz)
Kunal Nayyar (Koothrappali)
Mayim Bialik (Amy)
Melissa Rauch (Bernadette)

RECURRING CAST:

Kevin Sussman (Stuart)
Brian Posehn (Bert)

GUEST CAST:

Michelle Arthur (Mrs. Petrescu)
Joshua Banday (Nolan)
Bryan Safi (Daniel)
Tucker Albrizzi (Christopher)
Jareb Dauplaise (Jeff)

STORY BY: Steve Holland, Tara Hernandez, Jeremy Howe

TELEPLAY BY: Steve Molaro, Saladin K. Patterson, Anthony Del Broccolo

DIRECTED BY: Mark Cendrowski