Trivia: Actor Zac Efron's career began when he was just 11 years old, when his parents took note of his tremendous singing talent. They let him audition for a production of Gypsy, and he won a small role in a production that would run for 90 performances. He would eventually graduate to on-screen acting, scoring a recurring role on the hit series Summerland in 2004. This would seem like his big break, but an even bigger role would come the next year, in the hugely popular Disney feature High School Musical. Efron immediately earned a strong, loyal fan base, going on to star in big screen projects like Hairspray, 17 Again, Charlie St. Cloud, and The Lucky One.

Trivia: Is the child of two former stage actors who met while acting in New York City, but who both gave up the profession to start a family. Studied dance as a child, training in ballet, jazz and tap. Became interested in acting as a teenager, when he switched his focus from dance to drama. Worked at a casting agency while in high school. Auditioned for the roles of both Lip and Ian on Shameless before being cast as Lip, a character he describes as being very different from himself.

Trivia: Joined a theater program at the age of 15. Tried to study film and theater, but dropped out of school at the age of 17. Almost joined the Marines. Attended RAW Academy in London. Studied local accents while filming Beach Rats (2017) in the United States.

Trivia: At 14, ran away from home and took a Greyhound bus to Los Angeles to pursue a career as an actor, but his parents tracked him down and sent him to a boarding school in Ireland. After graduating from high school in Omaha, he studied French, art history and theatre in Paris. Was cast as an understudy in the Broadway production of Biloxi Blues. As a 46-year-old training for the lead role in the FX series Lights Out, McCallany fulfilled a lifelong dream to fight in an amateur boxing competition, winning a three-round decision against a German heavyweight.

Trivia: As adept at psychological drama as she is at broad physical comedy, Maura Tierney has fashioned one of the more enviable careers in Hollywood, moving with ease between lead and supporting roles on both the big and small screens. The daughter of a prominent Boston politician and a part-time real estate agent, Tierney was born and raised in the city's affluent Hyde Park district. She moved down the coast to attend New York University in the mid-'80s and quit just shy of receiving her diploma in order to join the neighboring Circle in the Square performance school. Despite her love for the city, the burgeoning actress decided to relocate to L.A. in the late '80s to find work. Although her first parts were dead-end bit roles on failed sitcom pilots, Tierney did meet her future husband, actor Billy Morrisette, when they were both fired from the set of a doomed Ralph Macchio series.It was Circle in the Square alumnus Richard Shepard who would give Tierney her first small film role, in his Manhattan-set screwball comedy The Linguini Incident (released in 1992). A lead role in a B-movie parody, Dead Women in Lingerie, did little to advance her career -- the actress has since purged the title from her official CV -- and she continued to toil in minor roles in low-profile TV shows and films before a last-minute casting choice landed her the lead in the sitcom pilot "The Station." Renamed NewsRadio for its March 1995 premiere, the ensemble comedy proved to be Tierney's breakthrough. As the over-achieving news producer Lisa Miller, the actress got a chance to showcase her heretofore unseen comic abilities: sly and ambitious but with a self-deprecating good humor, Tierney evoked a sort of late-millennium Mary Tyler Moore.Her buoyant work in NewsRadio won her meaty supporting roles in the hit comedies Liar Liar (1997) and Forces of Nature (1999); meanwhile, her noteworthy turn in the sleeper Primal Fear (1996) convinced casting directors that she could play heavier roles in films such as Primary Colors (1997) and Instinct (1999). Also during the series' four-year run, Tierney landed the plum role of a single mom who falls for hockey player Bruce Willis in a romantic comedy titled "The Broadway Brawler." After just two weeks' shooting, however, purported "creative differences" brought the project to a permanent halt.A signature leading role still eluding her, Tierney leapt at the opportunity to join the cast of NBC's flagship hour-long drama E.R. in late 1999. As Abby, the OB-GYN nurse working her way through med school, the actress began to nurture what she hoped would be a deeper, more complex character than afforded her in previous vehicles. Meanwhile, Tierney began work on her husband's directorial debut, an independent comedy titled Scotland, P.A. (2001), in which she plays a would-be fast-food matriarch who will stop at nothing to get to the top. Soon after, the actress landed a prime role in Insomnia (2002), director Christopher Nolan's much-anticipated follow-up to his twisty art-house hit Memento (2001). She finished out her run on ER, while still managing to score roles in big-screen fare such as Melvin Goes to Howard, Welcome to Mooseport, Baby Mama, and Semi-Pro.

Trivia: Worked with the Fortune Society, doing volunteer work in prison reform, in college. Considered being a Catholic priest or a social worker before pursuing acting. Studied acting under William Esper and Phil Gushee for seven years. Ran his own acting company, the Michael Harney Acting Studio, for eight years.

Trivia: Was a member of the National Youth Music Theatre, performing at the Edinburgh Festival and the Glasgow Music Festival. Played the dual roles of Taylor and Ella in a production of Vernon God Little at the Young Vic. Last name is a stage name that she adopted as a tribute to her father, Jamie, who died of cancer in 2000. Is an experienced singer with a mezzo-soprano range.

Trivia: Actor, stuntman, and college baseball player Michael Papajohn got his start in show business while he was attending Louisiana State University, where he played for the LSU Tigers. After having the opportunity to perform some stunts in the sports movie Everybody's All American in 1988, Papajohn began pursuing stunt and acting roles, appearing in movies like The Last Boy Scout and Mr. Baseball. He would find consistent acting work over the coming years, frequently making small appearances. He played an unnamed thug in 2000's Charlie's Angels and a security guard in the 2002 comedy The Hot Chick, and continued to take on several roles per year throughout the 2000s, notably appearing in I Know Who Killed Me, Spider-Man 3, and Terminator Salvation.