Penny Marshall
Garry Marshall, creator and then part-time writer for "Happy Days", cast Marshall and Cindy Williams to guest on an episode of the show. The installment, titled "A Date with Fonzie", aired on November 11, 1975 and introduced the characters Laverne DeFazio and Shirley Feeney (played by Marshall and Williams, respectively). In that episode, Laverne and Shirley were a pair of wisecracking brewery workers who were dates for Fonzie (Henry Winkler) and Richie (Ron Howard). The pair were such a hit with the studio audience that Garry Marshall decided to co-create and star them in a successful spinoff, "Laverne & Shirley" (1976–1983). The characters of Laverne and Shirley appeared in five more episodes of "Happy Days". In 1982 at the beginning of "Laverne & Shirley"s eighth season, Williams left the show due to her pregnancy. Marshall continued with the show, but it was canceled after the season's final episode aired in May 1983.
Olly Murs
Murs released an illustrated autobiography, "Happy Days", published by Coronet (an imprint of Hodder & Stoughton) on 11 October 2012. Photography for the book was shot by Dean Freeman, who has also worked on books for JLS, Michael Bublé and David Beckham, and Murs also recorded an audio version of the book that was made available to download. In January 2013 it was confirmed that Murs would guest star in a season 5 episode of the American drama series "90210" where he would perform "Troublemaker" and "Right Place Right Time". The episode aired on 22 April 2013. On 6 October 2013, Murs returned to "The X Factor" as a guest mentor to help judge Gary Barlow pick his finalist for the finals of the competition.