Career: Travolta eventually moved to Los Angeles to further his acting career. His big break came with sitcom Welcome Back Cotter; he also made an early movie appearance in Carrie. Saturday Night Fever and the film version of Grease proved he was a major force to be reckoned with. More big-screen outings followed but, despite the success of Look Who's Talking, a string of flops in the 1980s meant he fell out of favour until Quentin Tarantino cast him in Pulp Fiction in 1994. He's since made various hits, including Swordfish, Primary Colors and Get Shorty. Over the past few years he's appeared in Wild Hogs, Hairspray, From Paris with Love and The Taking of Pelham 123. He remains an A-list star.

Career: Newton-John released her first single in 1965, the long-forgotten Till You Say You'll Be Mine. Despite being homesick, she continued to perform live, including with her friend Pat Carroll. A brief spell in the band Toomorrow was followed by a regular stint on Cliff Richard's TV show. In 1974 she represented the UK at the Eurovision Song Contest. A year later, she moved to the US, where she was an instant hit. Grease made her an international star in 1978, with the album alone selling more than 28 million copies worldwide, but her acting career has been less successful since. She continues to record and perform live across the globe and is a committed environmental activist. Since 1966, Newton-John has sold 100 million records, the same number as Paul McCartney and Phil Collins. More recently, she re-created her Physical video in Glee with Jane Lynch.

Career: Channing's first stage appearance was in The Three Penny Opera. Her first big break was in the play The Two Gentlemen of Verona in the 1960s, while her TV debut came on a 1969 episode of Sesame Street. Worldwide stardom finally came with the 1978 musical Grease, in which she played a college-age bad girl, even though by then she was in her 30s. She had limited success in films throughout the 1970s and early 1980s, and eventually went back to the stage, where she garnered critical acclaim, winning a Tony award for her performance in A Day in the Death of Joe Egg. On the small screen, she had a recurring role in The West Wing, and starred in the sitcom Out of Practice.