Step by Step is an American television sitcom that aired for seven seasons, originally running on ABC as part of its TGIF Friday night lineup from September 20, 1991, to August 15, 1997, and then moved to CBS where it aired from September 19, 1997 to June 26, 1998. The series starred Patrick Duffy and Suzanne Somers as two single parents (each with three children), who spontaneously get married after meeting one another during a vacation, resulting in the two of them becoming the heads of a large blended family.