THEN & NOW: The cast of 'Harry Potter' 15 years later

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When the first movie in the "Harry Potter" series was released in 2001, Daniel Radcliffe was an 11-year-old kid with only a few acting credits to his name.

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Needless to say, a lot has changed since then. Radcliffe went on to gain international fame, playing roles on stage and screen. But he's not the only one. Many of his Hogwarts' classmates and professors have starred in some of our favorite films and television shows, from "Star Wars: The Force Awakens" to "Fear the Walking Dead."

Keep reading to see what 21 of your favorite witches and wizards have been up to since "Harry Potter."

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THEN: Daniel Radcliffe starred as bespectacled and famed wizard Harry Potter.

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NOW: Radcliffe's career has spanned stage and screen. He had roles in "Kill Your Darlings" and "Trainwreck" and starred in "How to Succeed in Business Without Really Trying" on Broadway in 2011. This year, Radcliffe was honored with his own star on the Hollywood Walk of Fame.

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THEN: Rupert Grint played Harry's redheaded best friend, Ron Weasley.

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NOW: Grint also went on to perform on Broadway, starring alongside Megan Mullally in "It's Only a Play" in 2014.

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THEN: Emma Watson was Hermione Granger, a bushy-haired and brilliant young witch.

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NOW: Watson went on to star in several other films, including "The Bling Ring" and "The Perks of Being a Wallflower." She was appointed the UN Women Goodwill Ambassador in 2014 and will star in a live-action "Beauty and the Beast" film in 2017.

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THEN: Maggie Smith kept Hogwarts students in line as Professor Minerva McGonagall.

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NOW: Smith is currently starring as the inimitable Violet Crawley, Dowager Countess of Grantham in the final season of "Downton Abbey." Since "Harry Potter," she's been seen in a number of films, including "The Best Exotic Marigold Hotel" and "Becoming Jane."

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THEN: Tom Felton made plenty of trouble for Harry and his Gryffindor pals as Draco Malfoy.

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NOW: Felton continued acting with roles in "Rise of the Planet of the Apes" and was also a recurring character on the TNT series "Murder in the First." Coincidentally, he'll be playing a character with the same name as Draco Malfoy's father, Lucius, in the upcoming film "Risen."

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THEN: Robbie Coltrane played beloved Hogwarts groundskeeper and half-giant Rubeus Hagrid.

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NOW: Coltrane played Mr. Jaggers in a 2012 adaption of "Great Expectations." You can also hear his voice as Lord Dingwall in Disney's "Brave."

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THEN: David Bradley portrayed the ever-shifty cat lover Argus Filch.

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NOW: Bradley can be spotted in "Game of Thrones" as the backstabbing lord Walder Frey.

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THEN: Alan Rickman played Severus Snape, the deeply tortured potions professor.

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NOW: Rickman continues acting, with roles in films like "The Butler" and "Gambit." He'll be voicing the blue caterpillar in this year's upcoming "Alice in Wonderland" sequel.

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THEN: Matthew Lewis played the often absent-minded Neville Longbottom.

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NOW: Lewis made headlines in 2014 for a magazine photo shoot so racy that even J.K. Rowling herself weighed in on Twitter. He's also had a recurring role on the BBC series "Bluestone 42."

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You can see Lewis' magazine shoot here.

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THEN: Michael Gambon waxed poetic as Hogwarts' headmaster, Albus Dumbledore.

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NOW: Gambon recently worked on another Rowling-inspired series, playing Howard Mollison in "The Casual Vacancy" in 2015.

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THEN: Emma Thompson looked into the future as Sybill Trelawney, Hogwarts' divination professor.

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NOW: Thompson was praised for her portrayal of beloved children's author P.L. Travers in "Saving Mr. Banks" in 2013. She'll play Mrs. Potts alongside Emma Watson's Belle in the 2017 live-action adaptation of "Beauty and the Beast."

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THEN: Gary Oldman broke our hearts as Harry Potter's late godfather, Sirius Black.

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NOW: You might remember Oldman's portrayal of Commissioner Gordon in the "Dark Knight" trilogy.

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THEN: Alfred Enoch was a loyal and true Gryffindor as Dean Thomas.

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NOW: Enoch stars alongside Viola Davis in ABC's "How to Get Away with Murder."

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THEN: Brendan Gleeson taught the importance of "constant vigilance" as the Auror "Mad-Eye" Moody.

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NOW: Gleeson played Inspector Arthur Steed in "Suffragette" in 2015.

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THEN: His son Domhnall Gleeson also appeared in the franchise as the eldest Weasley sibling, Bill.

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NOW: Gleeson has had a big year with roles in critically acclaimed "Ex Machina" and "The Revenant." Now, he's playing General Hux in "Star Wars: The Force Awakens." He'll reprise his role on the dark side in 2017's sequel.

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THEN: Ralph Fiennes terrified as the villainous Lord Voldemort.

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NOW: The Oscar-nominated actor starred as the infamous concierge M. Gustave in 2014's "The Grand Budapest Hotel" and more recently reprised his role as M in the latest James Bond film, "Spectre."

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THEN: Robert Pattinson battled bravely in the Tri-Wizard tournament as Cedric Diggory.

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NOW: Pattinson went on the star in a different fantasy franchise, as sparkly vampire Edward Cullen in "Twilight." He has also starred in several other romantic dramas, including "Water for Elephants" and "Remember Me This Way."

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THEN: Frank Dillane played Tom Riddle, a young and troubled wizard who would grow to become the treacherous Lord Voldemort.

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NOW: Dillane plays Nick Clark on "Fear the Walking Dead." He also recently nabbed a role chasing Moby Dick in "In the Heart of the Sea."

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THEN: David Thewlis played Remus Lupin, the kind-hearted werewolf.

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NOW: Thewlis played British physicist Dennis Sciama in "The Theory of Everything" in 2014. He's set to appear in 2017's "Wonder Woman" movie.

David Thewlis
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Helena Bonham Carter portrayed the witch we all loved to hate, Bellatrix Lestrange.

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NOW: In 2010, Bonham Carter was nominated for an Academy Award for her portrayal of Queen Elizabeth in "The King's Speech." She'll reprise her role as the Red Queen in "Alice Through the Looking Glass" later this year.

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THEN: Warwick Davis taught Harry and his friends the proper technique for levitation as Professor Flitwick. He also was one of two actors to portray Griphook the goblin.

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NOW: You can spot Davis as interstellar scout Wollivan in "Star Wars: The Force Awakens."

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