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Step by Step is an American sitcom that aired on CBS from 1991 to 1998. The show stars Patrick Duffy and Suzanne Somers as two single parents who fall in love and decide to merge their families. The show follows the lives of the family members as they navigate the ups and downs of blended family life.

The Lambert family consists of Frank (Patrick Duffy), a contractor and father of three boys, JT (Brandon Call), Mark (Christopher Castile), and Cody (Sasha Mitchell). The Foster family consists of Carol (Suzanne Somers), a hair salon owner, and her three children: Dana (Staci Keanan), Karen (Angela Watson), and Brendan (Josh Byrne). The two families come together when Frank and Carol spontaneously get married while on vacation in Jamaica.

The show focuses on the challenges that come with merging two families, such as dealing with different parenting styles, sibling rivalries, and fitting into a new household. The show also touches on issues such as teenage rebellion, dating, and the ups and downs of running a small business.

Staci Keanan plays Dana, the oldest child in the Foster family, who is a responsible and studious teenager. She often clashes with JT, the middle child in the Lambert family, who is more of a troublemaker and ladies' man. The youngest member of the Lambert family is Cody, who is delivered to the family by helicopter in the pilot episode. Cody's love of sports and general goofiness causes friction with his older brothers.

Angela Watson plays Karen, the middle child in the Foster family, who is a fashion-obsessed teenager with dreams of becoming a model. Mark, the middle child in the Lambert family, is a brainy kid with a love for science and computers. He often feels left out in the family's more athletic pursuits.

Christopher Castile plays Mark, the middle child in the Lambert family, who is a brainy kid with a love for science and computers. He often feels left out in the family's more athletic pursuits. Josh Byrne plays Brendan, the youngest member of the Foster family, who is a cute and mischievous child.

Peggy Rea portrays Ivy Baker, Carol's mother who loves to cook and often uses old-fashioned methods. Bronson Pinchot plays Frank's business partner, Jean-Luc Rieupeyroux. He is a flamboyant and quirky Frenchman who often provides comic relief on the show. Patrika Darbo plays Penny Baker, Carol's sister who is a wise-cracking divorcée. Emily Mae Young plays Lily Foster, Carol's niece who comes to live with the family in later seasons.

Other recurring characters on the show are David Lascher who played Brendan's friend and eventual love interest, Joey Russo. Marla Sokoloff portrays Gia Mahan, a rebellious teenager who is Dana's best friend. Sasha Mitchell portrays Cody's biological father, Frank's ex-girlfriend's brother, whom the Lamberts take in during the second half of the series.

The show features a number of guest stars throughout its run, including Fred Willard, Michelle Williams, and Clive Revill.

Step by Step was created by William Bickley and Michael Warren, who also created other popular shows like Full House and Family Matters. The show ran for seven seasons and 160 episodes before it was cancelled by CBS in 1998.

Overall, Step by Step is a heartwarming and humorous look at the challenges and joys of blended family life. It features a charming cast of characters, witty writing, and memorable storylines that have endeared it to audiences for generations.

Step by Step is a series that ran for 7 seasons (160 episodes) between September 20, 1991 and on CBS