When does Angel return?

Angel is an American sitcom that aired on CBS during the 1960–61 television season. Annie Fargé played the title character Angelique "Angel" Smith, a pretty, young, scatterbrained Frenchwoman, comes to the United States and marries a young architect. Doris Singleton as Angel's sympathetic friend Susie and Don Keefer as Susie's husband George.
The series focuses on Angel (David Boreanaz), an Irish vampire who is over 240 years old. Angel was known as Angelus during his rampages across Europe, but was cursed with a soul. He left Buffy the Vampire Slayer at the end of season 3 to move to Los Angeles in search of redemption.