Sarah Michelle Gellar, "The Ringer" Star Returns To "All My Children" On September 21: September is proving to be a big month for Sarah Michelle Gellar. The star of the CW "thriller" Ringer ", the first Sept.13, is also good on his promise to return to his roots on the soap" All My Children "before the series ends its 41 year run at the end of NBC this month. TV Guide reports that Gellar