The hilarious Jason Alexander discusses being Ellen’s neighbor and reveals his first job at 15, and then he shows off his roller-skating skills. Serena Williams talks about her recent wins, clothing line, and new book, and also plays badminton with Ellen.

Jason Alexander from “Seinfeld” chats with Ellen about his new children’s book and his son’s upcoming bar mitzvah, and he even takes a dip in the Jacuzzi. Plus, Amy Yasbeck reflects on her late husband John Ritter, her new show “Life on a Stick,” and her first-ever job.