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Original Show: Hercules: The Legendary Journeys; Relationship: The character Xena was introduced in Hercules before getting her own series.

Original Show: Lost; Relationship: Though not a traditional spin-off, it was thematically similar and sought to capitalize on the success and style of its predecessor.

Original Show: The Good Wife; Relationship: The show follows Diane Lockhart after she loses her savings and starts over at a new firm.

Original Show: Breaking Bad; Relationship: It's a prequel centered around the character Saul Goodman.

Original Show: Sons of Anarchy; Relationship: This show is set in the same universe and focuses on a rival motorcycle club seen in the original series.

Original Show: The Big Bang Theory; Relationship: This show is a prequel that follows the childhood of Sheldon Cooper in Texas.

Original Show: The Walking Dead; Relationship: This is a companion series and prequel which depicts the onset of the zombie apocalypse in the west coast.

Original Show: The Practice; Relationship: This series centers around civil litigator Alan Shore and the eccentric characters of Crane, Poole & Schmidt law firm.

Original Show: Star Trek; Relationship: Set in the same universe, the new series takes place about a century after the original missions of the USS Enterprise.

Original Show: Family Guy; Relationship: Cleveland Brown moves from Quahog to Virginia where he starts a new family.

Original Show: Happy Days; Relationship: The characters Laverne DeFazio and Shirley Feeney first appeared as dates for Fonzie before getting their own show.

Original Show: Diff'rent Strokes; Relationship: The character Mrs. Edna Garrett becomes a housemother at a boarding school for girls.

Original Show: Black-ish; Relationship: The series follows Zoey Johnson as she heads off to college and begins her journey to adulthood.

Original Show: Buffy the Vampire Slayer; Relationship: The character Angel is a vampire with a soul who was a love interest of Buffy before starting his own detective agency.

Original Show: Law & Order; Relationship: This series focuses on the victims of sexual crimes, led by Detective Olivia Benson.

Original Show: Star Wars franchise (movies/series); Relationship: The series is set in the Star Wars universe and follows a bounty hunter outside of the main saga's events.

Original Show: JAG; Relationship: This series spun off from the episode 'Ice Queen' and focuses on a team investigating Navy-related crimes.

Original Show: The Vampire Diaries; Relationship: Focuses on the Mikaelson siblings, also known as the 'Original' vampires, in New Orleans.

Original Show: All in the Family; Relationship: The characters George and Louise Jefferson were neighbors of the Bunkers before moving on up to the east side.

Original Show: The Tracey Ullman Show; Relationship: The Simpson family first appeared in sketches on The Tracey Ullman Show before getting their own animated series.

Original Show: Grey's Anatomy; Relationship: The series follows a group of firefighters and paramedics at a fire station in Seattle, part of the same universe as the medical drama.

Original Show: Friends; Relationship: The character Joey Tribbiani moves to Hollywood to pursue his acting career after the conclusion of the original series.

Original Show: Grey's Anatomy; Relationship: The character Dr. Addison Montgomery leaves Seattle Grace Hospital to join a private practice in Los Angeles.

Original Show: Beavis and Butt-Head; Relationship: Daria Morgendorffer was a recurring character who got her own show, highlighting her wit and misadventures in high school.