<Li> Christopher Knight (Peter Brady on ABC's The Brady Bunch) played Joanie's boyfriend on the season five episode "Be My Valentine" </Li> <Li> Cheryl Ladd appeared in "Wish Upon a Star" (season 2), playing the part of a Hollywood starlet Richie wins a date with </Li> <Li> Michael McKean and David L. Lander, of Laverne & Shirley, portrayed their "Lenny" and "Squiggy" characters in the season - six episode "Fonzie's Funeral" (Part 2) </Li> <Li> Eddie Mekka, also from Laverne & Shirley, portrayed his "Carmine" character in the season four's "Joanie's Weird Boyfriend" and the season six's "Fonzie's Funeral" (Part 2) </Li>

What happened to richie's brother on happy days