Step by Step (TV) Cast
The cast of Step by Step. Updated on September 17, 2025.
138 actors
Patrick Duffy
as Frank Lambert (160 episodes)

Patrick Duffy plays the role of Frank Lambert, a divorced contractor and the father of three children. He enters into a blended family when he marries Carol Foster.

Suzanne Somers
as Carol Foster Lambert (160 episodes)

Suzanne Somers portrays Carol Foster Lambert, a single mother of three children. She marries Frank Lambert, forming a blended family.

Brandon Call
as J.T. Lambert (160 episodes)

Brandon Call portrays John Thomas 'J.T.' Lambert, Frank Lambert's oldest son from his previous marriage. J.T. is depicted as a carefree and somewhat rebellious teenager.

Staci Keanan
as Dana Foster (160 episodes)

Staci Keanan plays the role of Dana Foster, Carol Foster's oldest daughter. Dana is portrayed as an intelligent and responsible teenager.

Christine Lakin
as Alicia Lambert (160 episodes)

Christine Lakin portrays Alicia 'Al' Lambert, Frank Lambert's middle child and only daughter. Al is depicted as a tomboy who enjoys sports and has a rebellious streak.

Angela Watson
as Karen Foster (160 episodes)

Angela Watson plays the role of Karen Foster, Carol Foster's middle child and Dana's younger sister. Karen is depicted as a popular and outgoing teenager.

Christopher Castile
as Mark Foster (160 episodes)

Christopher Castile portrays Mark Foster, Carol Foster's youngest son. Mark is depicted as a nerdy and intelligent child with a love for science.

Josh Byrne
as Brendan Lambert (141 episodes)

Josh Byrne plays the role of Brendan Lambert, Frank Lambert's youngest son. Brendan is depicted as an energetic and mischievous child.

Sasha Mitchell
as Cody Lambert (71 episodes)
Jason Marsden
as Rich Halke (67 episodes)
Emily Mae Young
as Lilly Foster-Lambert (43 episodes)
Bronson Pinchot
as Jean-Luc Rieupeyroux (24 episodes)
Jeff Juday
as Flash (24 episodes)
Patrika Darbo
as Penny Baker (22 episodes)
Peggy Rea
as Ivy Baker (22 episodes)
Alexandra Adi
as Samantha Milano (43 episodes)
Yvette Freeman
as (1 episode)
Shawn Levy
as Daniel (1 episode)
Peter Parros
as (1 episode)
Arjay Smith
as (1 episode)
Andrea Elson
as (1 episode)
Maggie Lawson
as (1 episode)
Kathy Kinney
as (1 episode)
Tiffani Thiessen
as (1 episode)
Rick Scarry
as (1 episode)
Al Molinaro
as (1 episode)
Paula Trickey
as (1 episode)
David Graf
as (1 episode)
Molly Cheek
as (1 episode)
Josh Keaton
as (1 episode)
Krissy Carlson
as (1 episode)
Debbie Gibson
as (1 episode)
Debby Boone
as (1 episode)
Natanya Ross
as (1 episode)
Nedra Volz
as (1 episode)
David Lascher
as (1 episode)
Paige Peterson
as (1 episode)
Terri Conn
as (1 episode)
Jennifer Lyons
as (1 episode)
Nick Spano
as (1 episode)
Suanne Spoke
as (1 episode)
Kathy Christopherson
as (1 episode)
George Wyner
as (1 episode)
JoAnna Garcia
as (1 episode)
Elizabeth Berkley
as (1 episode)
Michelle Williams
as (1 episode)
Spice Williams-Crosby
as (1 episode)
Dan Gilvezan
as (2 episodes)
Beau Billingslea
as (1 episode)
Lea Moreno Young
as (1 episode)
David Kaufman
as (1 episode)
Pat Crawford Brown
as (1 episode)
Michael Landes
as (1 episode)
June Angela
as (1 episode)
Aria Noelle Curzon
as (1 episode)
Erika Flores
as (1 episode)
Phillip Van Dyke
as (1 episode)
Jennifer Aspen
as (1 episode)
Devon Odessa
as (1 episode)
Marsha Clark
as (1 episode)
Kelly Packard
as (1 episode)
Ami Foster
as (1 episode)
Michael Cudlitz
as (1 episode)
Amy Chance
as (1 episode)
Troy Evans
as (1 episode)
Gina Gallego
as (1 episode)
John Asher
as (1 episode)
Lee Arenberg
as (1 episode)
Susan Blakely
as (1 episode)
Matt Crane
as (1 episode)
Shanelle Gray
as (1 episode)
Nancy Priddy
as (1 episode)
Mick Cain
as (2 episodes)
Walter Jones
as (1 episode)
Bruce Jarchow
as (2 episodes)
Eric Balfour
as Michael Fielder (1 episode)
Jerry Penacoli
as (1 episode)
Nancy Linari
as (1 episode)
Carolyn Mignini
as (1 episode)
Troy Slaten
as (1 episode)
Tommy Lister Jr.
as (1 episode)
John F. O'Donohue
as (1 episode)
Melanie Wilson
as (3 episodes)
Scott Foley
as (1 episode)
Ronnie Schell
as (1 episode)
Anna Slotky
as (1 episode)
Fred Willard
as (1 episode)
Portia Dawson
as (1 episode)
Shawn Christian
as (1 episode)
Shannon Elizabeth
as (1 episode)
Chris Young
as (1 episode)
Peter Dennis
as (1 episode)
Sage Allen
as (1 episode)
Nancy Lenehan
as (1 episode)
Christopher Darga
as (1 episode)
Bailey Chase
as (1 episode)
Chris Demetral
as (1 episode)
Donnie Jeffcoat
as (2 episodes)
Devon Gummersall
as (1 episode)
Jaclyn Bernstein
as (1 episode)
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