Caillou Wiki


239pages on
this wiki
Add New Page
Talk0 Share
is a 4 year old who is one of Caillou's friends. He has a twin brother named Jeffery. Jason and Jeffery first appeared appeared in Season 2 in the episode New House, New Neighbors. Back then he and Jeffery both wore idntical clothes (red shirts with a white stripe and pants) but, in Season 4 Jason began to wear a white shirt with a red stripe and they are now able to be told apart. In the episode Caillou the chef , Jason has a toy spider named Boris. Towards the end of Season 2 he and Jeffery began coming to Caillou's playschool class. In Seasons 2 and 3, he and Jeffrey appear to be mischievous and sometimes a little mean to Caillou but, in Season 4, they are nicer to Caillou and more of kind people. He is voiced by Adam Mover


  • New House, New neighbors
  • After Dark!
  • Snow footprints
  • Playschool games
  • Something for everyone
  • Heavy Rain
  • Valentine's day
  • Caillou the chef
  • Where I saw it last
  • A surprise for Ms.Martin
  • Caillou of the antarctic

Note: Although Jason and Jeffery are twins they don't appear in all the same episodes Jason doesn't appear in the episode that Jeffery appears in Garage sale and Jeffery doesn't appear in A surprise for Ms.Martin

Caillou's Playschool class
Caillou Clementine Emma Jason Jeffery Leo Xavier

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.