Career: Castellaneta started working at The Second City, an improvisational comedy theatre, in 1983 and stayed until 1987. During this time, he did voiceover work for various radio stations. He was hired to work on The Tracey Ullman Show and he started voicing Homer Simpson in The Simpsons, which was initially aired as a series of animated shorts. The Simpsons has since become a half-hour show and Castellaneta has continued to provide the voice of Homer. He has also voiced many other characters, including Grampa Simpson, Barney Gumble and Krusty the Clown. Castellaneta and his wife, Deb Lacusta, have also written several episodes of The Simpsons. He has done voice acting for a number of other animated series too, including Back to the Future, Aladdin, Earthworm Jim, Hey Arnold!, The Batman and Futurama. Besides voice acting, Castellaneta has had on screen parts in such series as Entourage, Everybody Loves Raymond, Friends, Greek, Parks and Recreation, How I Met Your Mother and Desperate Housewives. He has appeared in such films as K-9 (1989), The War of the Roses (1989), The Pursuit of Happyness (2006), Super 8 (2011) and Fantastic Four (2015).

Career: Kavner won her first notable role on popular comedy series Rhoda as Brenda Morgenstern in 1974 and stayed on until it finished four years later, winning an Emmy award for her performance. She then moved on to guest stints on The Tracey Ullman Show, in which a number of animated shorts were to be included. Producers were looking for voices for the cartoons and enlisted the actress. This just happened to turn into The Simpsons, which proved a runaway success. Despite voicing Marge since 1988 (and reportedly earning more than $400,000 per episode), Kavner has fitted in several film roles over the years, including her first starring role in This Is My Life from 1992.

Career: Cartwright's first professional voice acting role was in the animated series Richie Rich. She went on to appear on-screen in the leading role in TV film Marian Rose White (1982) and her first feature film was Twilight Zone: The Movie (1983). In 1987, she auditioned for a role on The Simpsons while it was a series of animated shorts on The Tracey Ullman Show. She voiced Bart Simpson for three seasons on The Tracey Ullman Show and has retained the role ever since The Simpsons became a half-hour show. Cartwright also voices other characters on The Simpsons, including Nelson Muntz, Ralph Wiggum and Todd Flanders. Besides The Simpsons, Cartwright has voiced Chuckie Finster in Rugrats and All Grown Up!, Mindy in Animaniacs, Rufus in Kim Possible and many other characters. She has also appeared on-camera in The Fresh Prince of Bel-Air, 24, Empty Nest and Godzilla (1998).

Career: Smith appeared in a number of Broadway productions before landing her first film roles in Heaven Help Us (1985) and The Legend of Billie Jean (1985). She moved to Los Angeles in 1986 and landed a recurring role in the TV series Brothers. In 1987, she auditioned for The Simpsons shorts on The Tracey Ullman Show. She has voiced Lisa Simpson ever since and the series was spun into a half-hour show in 1989. Away from The Simpsons, Smith played Louise in the sitcom Herman's Head. She has also appeared in such series as Dharma & Greg, Dead Like Me, Mad Men, The Big Bang Theory and The Mindy Project. Her film credits include City Slickers (1991), Jingle All the Way (1996) and As Good as It Gets (1997).

Career: A few bit parts in comedy series were to be Hank's first roles, but it was his voice that earned him the attention of The Simpsons' bosses; he has provided his vocal talents for the iconic show since its launch in 1989. Azaria's comedy credentials earned him roles in Pretty Woman and Point Blank. He would give a memorable performance in Robin Williams' The Birdcage, playing a Guatemalan cleaner named Agador Spartacus. He also had a small cameo in Along Came Polly in 2004, guested on Friends and was seen in British comedy Run Fat Boy Run, as well as Mystery Men, Godzilla and Night at the Museum 2. Azaria has four Emmys to his name and a reputation as being one of the most talented and versatile actors in the business.

Career: In 2007, Katy signed to Capitol Music Group, changed her name to Katy Perry and released her first single, Ur So Gay, online. The departure from her gospel roots attracted some attention, but it was second single I Kissed a Girl that catapulted her to fame. She scored a number one across the world, and follow-ups Hot N Cold and Thinking of You, from the album One of the Boys, were also big hits. Her second album Teenage Dreams was released in 2010 and its lead single California Gurls also went to number one. She made her film debut voicing a Smurfette in The Smurfs (2011) and reprised her role in the 2013 sequel. She has also guest starred in episodes of How I Met Your Mother and Raising Hope. She continues to release albums and headline world tours.