Celebrities Without Their Makeup

Pirates of the Neverland: At Wit's End, Batman Family Feud

 * Dwayne Johnson = An old man
 * Amy Winehouse = Oscar the Grouch (Sesame Street)
 * Iron Man = C3PO
 * Maggie Gyllenhaal = Droopy Dog
 * Robert Pattinson = Alfred E. Neuman (MAD's mascot)

DaGrinchy Code/Duck
(These are all Christmas-related.)
 * Santa Claus = Popeye
 * Russel Brand = A nutcracker
 * Lady Gaga = A Christmas tree
 * Cameron Diaz = The Grinch
 * SpongeBob SquarePants = A fruitcake

The Straight A-Team/Gaming's Next Top Princess

 * Jane Lynch = Mickey Roark
 * Zach Galifianakis = Benson (Regular Show)
 * Snow White = Betty White
 * Mike Tyson = A bulldog
 * Adrian Brody = The Black Spy

Fast Hive/Minute to Flynn It

 * Rihanna =
 * Andy Samberg =
 * Fred (Scooby-Doo) =
 * Emma Watson =
 * Jay Leno =

Trivia

 * DaGrinchy Code, Duck is the first segment to include a holiday-related segment (Christmas one).
 * In Season 1 Episode 14, the MAD news announced that Russell Brand tweeted Katy Perry without her makeup, making her look like a lemur.