Step by Step - Season 4 - Eps 1: Karate Kid
Mark feels his friends don't respect him, and his mother babies him. In order to earn respect he joins a Karate class. His teacher kicks him out for being too wimpy. Cody agrees to help Mark prepare for the big karate tournament (Cody is a black belt) in a month and Mark becomes a totally new man. He faces the best person in the first match and falls behind quickly. Cody, however, notices his weakness and Mark uses it to catch up and force the guy to the final point. Mark loses the match, but wins respect from everybody except the coach of the other guy who mocks him and Cody and then challenges Cody to a karate match. Cody beats him badly. Frank is tired of all the yelling in the house so he installs an intercom that has a radio in it, but he is forced to destroy it when it wakes everyone up in the middle of the night.
About Step by Step

Title: Step by Step
First Air Date: 1991-09-20
Last Air Date: 1998-06-26
Status: Ended
Rating: 7.717/10 (from 392 votes)
Language: EN
Seasons: 7
Total Episodes: 160
Network: ABC
Genres: Comedy, Family
Production Companies: Warner Bros. Television, TyC Sports
Synopsis
Step by Step is an American television sitcom with two single parents, who spontaneously get married after meeting one another during a vacation, resulting in them becoming the heads of a large blended family
Cast

Patrick Duffy
Frank Lambert

Suzanne Somers
Carol Foster Lambert

Brandon Call
J.T. Lambert

Staci Keanan
Dana Foster

Christine Lakin
Alicia Lambert

Angela Watson
Karen Foster

Christopher Castile
Mark Foster

Jason Marsden
Rich Halke

Emily Mae Young
Lilly Foster-Lambert

Alexandra Adi
Samantha Milano