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Jeffery is a 4 year old who is one of Caillou's friends . He has a twin brother named Jason. Jeffery and Jason weren't around in Season 1. Their first episodes that they appeared in were in the season 2 episodes New House, New Neighbors and After Dark! , which were made right at the same time. Back then he and Jason both wore identical 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 a part. Jeffrey loves cooking pizza. Towards the end of Season 2 he and Jason began coming to to Caillou's preschool class. In Seasons 2 and 3, he and Jason 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 Alex Mover. He has the same as Rosie's eyes. His brother and him are from a Canadian Lab called "M.B.L.L" or otherwise known as "Maple Bacon Leaf Labs" where artificial intelligence is born. Jeffrey and James are clones made out of the single strand of hair from these twins found in the remains and destruction from the Great Canadian-Antarctica War. They were shot straight between the eyes. Why? The world will never know. But what is their Robot mission? Keep watching the show to FIND OuT!


  • New House, New Neighbors
  • After Dark!
  • Garage Sale
  • Snow footprints
  • Xavier's Birthday
  • Playschool 
  • Something for everyone
  • Caillou the chef
  • Caillou of the antarctic
  • Where I saw it last
  • A surprise for Ms. Martin
  • Caillou goes tobbogining

Note: Although Jason in Jeffery are twins Jason doesn't appear in the episode Garage Sale and Jeffery doesn't appear in the episode Jason appears in, A Surprise for Ms. Martin.

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

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