The O'Brien dynasty (Irish: Uí Briain or Ua Briain; Modern: Ó Briain; IPA:oːˈbʲɾʲiənʲ) are a royal and noble house founded in the 10th century by Brian Boru of the Dál gCais or Dalcassians. After becoming King of Munster, through conquest he established himself as Ard Rí na hÉireann (High King of Ireland). Brian's descendants thus carried the name O'Brien, continuing to rule the Kingdom of Munster until the 12th century where their territory had shrunk to the Kingdom of Thomond which they would hold for just under five centuries.

In total, four O'Briens ruled in Munster, and two held the High Kingship of Ireland (with opposition). After the partition of Munster into Thomond and the MacCarthy Kingdom of Desmond by Tairrdelbach Ua Conchobair in the 12th century, the dynasty would go on to provide around thirty monarchs of Thomond until 1542. During part of this period in the late 13th century they had a rivalry with the Norman de Clare house, disputing the throne of Thomond. The last O'Brien to reign in Thomond was Murrough O'Brien who surrendered his sovereignty to the new Kingdom of Ireland under Henry VIII of the House of Tudor, becoming instead Earl of Thomond and maintaining a role in governance. Today the head carries the title of Prince of Thomond, and depending on succession sometimes also Baron Inchiquin.

Conan Christopher O'Brien (born April 18, 1963) is an American television host, comedian, writer, producer and performer. Since November 2010 he has hosted Conan, a late-night talk show that airs on the American cable television station TBS.

O'Brien was born in Brookline, Massachusetts, and raised in an Irish Catholic family. He served as president of the Harvard Lampoon while attending Harvard University, and was a writer for the sketch comedy series Not Necessarily the News. After writing for several comedy shows in Los Angeles, he joined the writing staff of Saturday Night Live, and later of The Simpsons. He hosted Late Night with Conan O'Brien from 1993 to 2009, followed by seven months hosting The Tonight Show with Conan O'Brien, the only person to serve as the permanent host for both NBC programs.

O'Brien was born in Brookline, Massachusetts (a suburb of Boston) to Thomas O'Brien, a physician, epidemiologist, and professor of medicine at Harvard, and Ruth O'Brien (née Reardon), an attorney and partner at the Boston firm Ropes & Gray. He is the third of six children. O'Brien's family is Irish Catholic and descends from pre-Civil War era immigrants. In a Late Night episode, O'Brien paid a visit to County Kerry, Ireland, where his ancestors originated.

Henry Albert "Hank" Azaria ( /əˈzɛəriə/ ə-ZAIR-ee-ə; born April 25, 1964) is an American film, television and stage actor, director, voice actor, and comedian. He is noted for being one of the principal voice actors on the animated television series The Simpsons (1989–present), on which he performs the voices of Moe Szyslak, Apu Nahasapeemapetilon, Chief Wiggum, Comic Book Guy, Carl Carlson and numerous others. Azaria, who attended Tufts University, joined the show with little voice acting experience, but became a regular in its second season. Many of his performances on the show are based on famous actors and characters; Moe's voice, for example, is based on actor Al Pacino.

Alongside his continued voice acting on The Simpsons, Azaria became more widely known through his live-action appearances in films such as The Birdcage (1996) and Godzilla (1998). He has continued to star in numerous films including Mystery Men (1999), America's Sweethearts (2001), Shattered Glass (2003), Along Came Polly (2004), Run Fatboy Run (2007), Night at the Museum: Battle of the Smithsonian (2009) and The Smurfs (2011). He also had recurring roles on the television series Mad About You and Friends, and starred in the drama Huff (2004–2006), playing the titular character, as well as appearing in the popular stage musical Spamalot. Originally primarily a comic actor, in recent years Azaria has taken on more dramatic roles including the TV films Tuesdays With Morrie (1999) and Uprising (2001). He has won four Emmys and a Screen Actors Guild Award. Azaria was married to actress Helen Hunt from 1999 to 2000.

Dylan O'Brien (born August 26, 1991) is an American actor. He was born in New York City and grew up in Springfield Township, Union County, New Jersey before moving with his family to Hermosa Beach, California when he was 12 years old. As of July 2011, he co-starred as Stiles in the MTV series Teen Wolf. He also co-starred the film High Road and appeared in the film The First Time with Victoria Justice and Britt Robertson and directed by Jon Kasdan.

O'Brien began as a YouTube star with his mother as an actress and his father a camera operator. He auditioned for MTV's Teen Wolf, a series loosely based on the 1985 film of the same name, while planning to pursue college, making an agreement with his parents that provided he was not selected for a role, his sights would set on attending film school. However, after 4 auditions, O'Brien scored a major role. According to an interview on the SmodCast Internet Radio show Plus One Per Diem, he was sent a script for the lead character and main protagonist, Scott McCall. Dylan reported that he had no previous knowledge of the 1985 film of the same name and that after reading the script was immediately drawn to the character of Stiles Stilinski, who is the best friend of main character Scott within the series. After reading the script, O'Brien spoke to his manager on auditioning for the role of Stiles, which he later auditioned for and was well received by Producer Jeff Davis and Director Russell Mulcahy and briefly after received network character approval.

Selena Marie Gomez (born July 22, 1992) is an American actress and singer best known for portraying Alex Russo in the Emmy Award-winning Disney Channel television series Wizards of Waverly Place. She subsequently ventured into feature films and has starred in the television movies Another Cinderella Story, Wizards of Waverly Place: The Movie, and Princess Protection Program. She made her starring theatrical film debut in Ramona and Beezus.

Her career has expanded into the music industry; Gomez is the lead singer and founder of the pop band Selena Gomez & the Scene, which has released three RIAA Gold certified studio albums, Kiss & Tell, A Year Without Rain, and When the Sun Goes Down, spawned three RIAA Platinum certified singles, "Naturally", "Who Says" and "Love You Like a Love Song" and charted four No. 1 Billboard Hot Dance Club Songs. Gomez has also contributed to the soundtracks of Tinker Bell, Another Cinderella Story, Wizards of Waverly Place, and Shake It Up after signing a record deal with Hollywood Records.