Career: Montgomery left home at 16 to go travelling, and two years later ended up in Los Angeles, harbouring dreams of becoming an actress. She worked at a well-known clothing store to make ends meet, but in the mid-1990s gained small roles in Party of Five, NYPD Blue, and Devil in a Blue Dress. Her first big role was in Dead Man on Campus, in 1998. Three years later, she played her idol Marilyn Monroe in miniseries Blonde. Her role as FBI agent Samantha Spade in Without a Trace made her a star in 2002. Since that series ended in 2009, she has starred in the TV movie Lying to be Perfect, and she will be playing JK Rowling in a made-for-TV movie about the Harry Potter author called Magic Beyond Words and secured the role of Det Carrie Wells in the US crime drama Unforgettable.

Career: After completing his degree, Walsh moved to New York to further his acting career. He made his TV debut in sitcom Kate & Allie in 1987, using the stage name Charlie Walsh. He's also been credited as Charles Hunter Walsh. His first film was 1989's Loverboy, which he followed with Where the Heart Is, Betsy's Wedding, and a regular part in TV series Gabriel's Fire. Supporting roles in Nobody's Fool, Congo, We Were Soldiers, Blood Work, and small-screen drama Brooklyn South raised his profile, but it was Nip/Tuck in 2003 that made him a star, with him remaining in the cast until its conclusion in 2010. He has since appeared in the US TV series Unforgettable.

Career: Smith first made a name for himself in a small indie film Hate Crime. He played a gay man, who was a victim of intolerance at the hands of a son of a fundamentalist preacher. Smith has starred in two other films: The War Boys and Red Hook. He has also appeared in TV shows including Law & Order in 2009 and Agatha Christie's Poirot: Murder on the Orient Express. He has also performed in several theatre productions, including the Broadway play Come Back, Little Sheba. The role he is best known for is that of Lt Matthew Scott in the military science fiction series SGU: Stargate Universe, which blasted onto the small screen in 2009. Smith reappeared on ITV over Christmas 2010 in Agatha Christie's Poirot. He has made guest appearances in a number of American shows since then.