Alex the Lion (voiced by Ben Stiller) is one of four protagonists in Jaden goes to Madagascar. He loves his life in the Central Park Zoo of New York City because he's a sort of celebrity to the people. When his friend, Marty the Zebra, left the zoo to go to the wild, Alex, Jaden, and the others went to find him, only to end being in crates and shipped to Kenya. But they ended up on the shores of Madagascar. While the others were having fun, Alex wanted to go home, and became so hungry that he tried to eat his friends. But when he was given fish instead of steak, he finally calmed down.
- Alex will reappear in Jaden's Adventures of Madagascar 2, where he will meet his long lost family.
- Alex will reappear in Jaden's Adventures of Madagascar 3, where he will join a circus and fall in love with Gia the Jaguar.
- In another adventure series, he is married to Lionette.
- Alex's stage name is "The King of New York", which also happens to be the name of a song from "The Newsies."
- Alex will meet Jeffrey and his team in Jeffrey & Friends go to Madagascar.
- Alex will reunite with them in Jeffrey & Friends' Adventures of Madagascar: Escape 2 Africa and Jeffrey & Friends' Storm Adventures of Madagascar 3: Europe's Most Wanted.
- Alex (along with Marty, Gloria, Melman, Zuba, Florrie, Leonette, Vitaly, Gia and Stefano) will guest star in Jeffrey & Friends' Storm Adventures of Zoboomafoo.
- Alex will guest star in Wedding Duels Part 1 and Wedding Duels Part 2.
- Alex will guest star in Pooh's And Jaden's Adventures of ChalkZone The Big Blow Up.
- Alex will attend Jeffrey and Aqua's wedding in Key of Flaming Union.