Who does the voice of alex in madagascar?
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Who does the voice of Alex in Madagascar films and TV specials?
Ben Stiller
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Who does the voice of Alex in the first Madagascar video game and spin-offs ?
Wally Wingert
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Who does the voice of Alex as a cub in Madagascar?
Quinn Dempsey Stiller, Declan Swift
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Who does the voice of Alex in the second and third Madagascar video games?
Crispin Freeman
Madagascar (2005 film)
https://en.wikipedia.org/wiki/Madagascar%20%282005%20film%29
n 2005, Stiller appeared in Madagascar, which was his first experience as a voice actor in an animated film. Madagascar was a massive worldwide hit, and spawned the sequels Madagascar: Escape 2 Africa in 2008 and Madagascar 3: Europe's Most Wanted in 2012.[62]
Ben Stiller
Merry Madagascar is a Christmas special first broadcast on NBC in November 2009, which starred the characters from the Madagascar film series. The story appears to takes place sometime between the first and second films. It featured many of the same voice actors as the films, including Ben Stiller, 
Madagascar (franchise)
 It featured many of the same voice actors as the films, including Ben Stiller, Chris Rock, David Schwimmer, a
Madagascar (franchise)
a direct-to-DVD Valentine's Day-themed short film[20] released on January 29, 2013,
Madagascar (franchise)
The Penguins of Madagascar video game is a Nintendo DS action-adventure game based on the TV show of the same name. The game was released by THQ on November 2, 2010 and was developed by Griptonite Games.[
The Penguins of Madagascar Video games
The Penguins of Madagascar: Dr. Blowhole Returns – Again! 
The Penguins of Madagascar Video games
All Hail King Julien is an American computer-animated 3D streaming television series.
All Hail King Julien
before the events of the first film, making it a prequel.
All Hail King Julien
and a son Quinlin Dempsey "Quinn" Stiller 
Ben Stiller
Ben Stiller does the voice of Alex the lion in the film Madagascar and the movie's sequels,  Madagascar: Escape 2 Africa and Madagascar 3: Europe's Most Wanted. However, in Madagascar Escape 2 Africa, Quinn Dempsey Stiller, Declan Swift do the voice of Alex as a cub with Quinn Dempsey Stiller being Ben Stiller's real life son. Ben Stiller also does the voice of Alex the lion in Merry Madagascar, a 2009 television Christmas special that aired on NBC and Madly Madagascar, a direct-to-DVD Valentine's Day-themed short film that was released in 2013. Wally Wingert does the voice of Alex in the first Madagascar video game, The Penguins of Madagascar, and its spin-off, The Penguins of Madagascar: Dr. Blowhole Returns – Again!. Crispin Freeman plays Alex the lion in All Hail King Julien, an American computer-animated 3D streaming television series that is a prequel to the first Madagascar film.