A recurring character is a fictional character, usually in a prime time TV series, who frequently appears from time to time during the series' run. Recurring characters often play major roles in more than one episode, sometimes being the main focus. They may be contrasted with "regular" characters, who typically appear in every or almost every episode of a series. Recurring characters appear less frequently than regulars, but more frequently than guest star characters, who may appear in only one or two episodes without being expected to return. Recurring characters sometimes start out as guest stars in one episode, who then reappear in future episodes because creators or audiences found the actors or storylines compelling enough to revisit. Sometimes a recurring character eventually becomes part of the main cast of characters; such a character is sometimes called a breakout character. Some notable examples of main characters who were originally recurring characters are: Eli Gold on The Good Wife; Leo Chingkwake on That '70s Show; Angel and Oz on Buffy the Vampire Slayer; Marc St. James on Ugly Betty; Vanessa Abrams on Gossip Girl; Zack Allan on Babylon 5; Steve Urkel on Family Matters; Donna Moss on The West Wing; Steve Harrington on Stranger Things; and Felicity Smoak on Arrow. In other cases, recurring characters have been given spin-off series of their own, such as Dr. Frasier Crane who originally was a recurring character on Cheers. Kelsey Grammer, along with fellow recurring actor John Ratzenberger were hired for seven episodes, to play Frasier Crane and Cliff Clavin respectively. Cliff was scheduled to recur during the 1982–1983 season, Frasier to recur during 1984–1985 season. Both actors were subsequently upgraded to the main cast, and Crane continued in his own series following the end of Cheers. On sketch comedy programs, recurring characters are generally a staple. For example, in the sketch comedy series Your Show of Shows, Sid Caesar used the concept frequently: Usually they appear in their own sketch and the sketch itself can become a regular part of the show. Some notable examples include the Church Lady and Hans and Franz from Saturday Night Live, the Gumbys from Monty Python's Flying Circus, and Bob and Doug McKenzie from SCTV. However, the characters are not always limited to their own sketches. Sometimes, characters from a recurring sketch go on to appear in other sketches, or develop into their own TV shows. For