Step by Step is an American television sitcom created by William Bickley and Michael Warren that ran on ABC as part of its TGIF Friday night lineup from September 20, 1991, to August 15, 1997, then moved to CBS, where it aired from September 19, 1997, to June 26, 1998, with a total of 160 half-hour episodes spanning seven seasons. The series follows Patrick Duffy and Suzanne Somers who star as single parents Frank and Carol, respectively, each with three children, who wed and form a blended family.