"Zoo Tube" is the forty-third episode of season 1 from The Penguins of Madagascar.
After waiting alone for visitors to come to the zoo, Skipper finds the other penguins watching the "Dumb Animal Channel" Rico discovered on TV. Skipper takes a peak at it, and he soon gets addicted, too. Marlene appears and tells the penguins to come quick and there is a rumor going around than the zoo is closing forever.
- A picture of Mr. Chew briefly appears on the wall in someone's house.
- The same Badger book also appears in Alice's office.
- One of King Julien's calendars appears in Alice's office.
- Running Gag: The animals keep making plans to have them stay at the zoo.
- The title of this episode is a pun on YouTube, an online video sharing website.
- There is a reference to Alex the lion from the Madagascar films, when a man in car asks "Did you watch the part where the old lady was smacking around that lion?" before he was knocked out by Skipper's famous knock-out slap.