Halloween 2014: Nathan Fillion Goes Back To The Future, Supernatural Switcherooo And More
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GOTHAM's Sean Pertwee as DOCTOR WHO's Third Doctor — who was played by his father, Jon Pertwee
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Natalie Morales (TROPHY WIFE, not TODAY) as TRUE DETECTIVE's Rust Cohle
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SUPERNATURAL's Misha Collins, Jared Padalecki and Jensen Ackles switch things up as Dean, Castiel and Sam
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Sarah Michelle Gellar as STAR WARS' Princess Leia
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Billy Crystal as BREAKING BAD's Walter White (aka "Crystal Meth"?)
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ARROW's Colton Haynes and Emily Bett Rickards as SHREK's Princess Fiona and an astronaut
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ONCE UPON A TIME's Jennifer Morrison as HARRY POTTER's Hermione
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FALLING SKIES' Sarah Sanguin Carter as Courtney Love
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GLEE's Dianna Agron
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GLEE's Lea Michele
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AGENTS OF S.H.I.E.L.D.'s Ming-Na Wen as The Cat in the Hat
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AGENTS OF S.H.I.E.L.D.'s Chloe Bennet as... L.A.U.N.D.R.Y.
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Neil Patrick Harris, David Burtka and kids as The Riddler, The Joker, Batman and Batgirl
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MODERN FAMILY's Jesse Tyler Ferguson and husband Justin Mikita as "Dumb and Dumber"
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DAYS OF OUR LIVES' Chrishell Stause and YOUNG & RESTLESS' Melissa Claire Egan as Jessica Rabbit and Rainbow Dash
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MISTRESSES' Alyssa Milano as Rainbow Dash
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YOU'RE THE WORST's Aya Cash as ORPHAN BLACK's "Allison"
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CASTLE's Nathan Fillion as BACK TO THE FUTURE's Marty McFly (See more Fillion pics on WhoSay)
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Annie Wersching (BOSCH, 24) and son as TEENAGE MUTANT NINJA TURTLES
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SCANDAL creator Shonda Rhimes as Smelly Mellie (See more Shonda pics on WhoSay)
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SCANDAL's crew as the Olivia Pope Synchronized Swimming Team (who performed to "Torn Between Two Lovers")
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SCANDAL's Katie Lowes on ELLEN as the Tooth Fairy
(Get it — Quinn extracts teeth....)
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CRIMINAL MINDS' A.J. Cook and husband Nathan Andersen as VIKINGS
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Josh Gad (NEW GIRL, FROZEN) as ORANGE IS THE NEW BLACK's "Red"
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GOOD MORNING AMERICA's Robin Roberts as Queen Elsa (with DWTS' Tony Dovolani)
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GOOD MORNING AMERICA's Ginger Zee as Ariana Grande
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GOOD MORNING AMERICA's Amy Robach as Maleficent
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GOOD MORNING AMERICA's Lara Spencer as Prince George
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GOOD MORNING AMERICA's George Stephanopoulos (with Ali Wentworth) as newlyweds George Clooney and Amal Alamuddin
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TODAY's Matt Lauer as SATURDAY NIGHT LIVE's "Pat"
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TODAY's Willie Geist and Tamron Hall as SATURDAY NIGHT LIVE's Spartan Cheerleaders
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TODAY's Natalie Morales as SATURDAY NIGHT LIVE's "Mary Katherine Gallagher"
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TODAY's Lester Holt and Al Roker as SATURDAY NIGHT LIVE's Blues Brothers
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TODAY's Kathie Lee Gifford and Hoda Kotb as SATURDAY NIGHT LIVE's "Wayne and Garth"
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TODAY's Savannah Guthrie, Jenna Bush Hager and Meredith Vieira as SATURDAY NIGHT LIVE's "Mom Jeans" moms