3.Heath Ledgeralmost starred as Bruce Wayne in Batman Begins before eventually being cast as the Joker in The Dark Night.
4.Before being cast as Gina, Chelsea Peretti originally auditioned for Rosa on Brooklyn Nine-Nine.
5.Courteney Cox originally auditioned for Rachel on Friends before she was cast as Monica.
6.Originally, Rachel McAdams auditioned for Cady Heron in Mean Girls before booking the role of Regina George.
7.The Walking Dead star Norman Reedus originally auditioned for Merle before he was cast as Daryl Dixon.
8.Also, Sonequa Martin-Green auditioned for Michonne on The Walking Dead before she was cast as Sasha.
9.The Office star Rainn Wilson read for the role of Michael before booking Dwight.
10.Before being cast as Paris Geller, Liza Weil originally auditioned for Rory Gilmore on Gilmore Girls.
11.Eddie Redmayne originally auditioned to play Tom Riddle in Harry Potter and the Chamber of Secrets way before playing Newt Scamander in Fantastic Beats and Where to Find Them.
12.Supernatural star Jensen Ackles originally auditioned for Sam before asking to also audition for Dean.
13.Pretty Little Liars star Janel Parrish first auditioned for Spencer before landing the role of Mona.
14.Liam Hemsworth originally auditioned for Peeta in The Hunger Games before landing the role of Gale.
15.Jessica Capshaw originally auditioned to play both Nurse Rose and Dr. Sadie Harris on Grey's Anatomy before being cast as Arizona Robbins.
16.Laura Prepon auditioned for Piper on Orange Is the New Black before booking the role of Alex Vause.
17.Also, Natasha Lyonne originally read for the role of Lorna on Orange Is the New Black before being cast as Nicky.
18.Veronica Mars star Jason Dohring originally auditioned for Duncan before landing the role of Logan.
19.And finally, Game of Thrones star Iwan Rheon originally auditioned for Jon Snow before booking the role of Ramsay Bolton.
