Set in the 1950s and 1960s, Happy Days followed the adventures of all-American teen Richie Cunningham and his circle of family and friends. 

The cheery sitcom initially aired in the US on ABC from 1974 to 1984. Despite initially receiving mixed reviews, it went on to become one of the most popular shows of the 1970s. It ran for an impressive 255 episodes over 11 seasons, drawing in an astonishing 30.5 million American viewers for its finale.

Read on as we take a look at the stars of Happy Days then and now and discover who built the biggest fortune.

All dollar amounts in US dollars.