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"Safety first, means you don't rush in where you don't belong!"
— Miss Jenny scolding Jack after his accident.

Jack Jumps In is the seventh episode of the sixth season.


Thomas is sent by The Fat Controller to pick up a special from Jenny Packard. He arrives to see that his special is an eager front-loader named Jack to help the Pack clear ground for railway lines at the quarry. Thomas drops him off there and Jack looks for someone to help. He asks Oliver the Excavator and Byron the Bulldozer, whom both decline the need for help and Byron asks Jack to try Kelly the Crane. When Jack introduces himself, a lorry named Isobella rudely tells him to mind her paint work, but apologises and welcomes Jack after Kelly scolds her. They advise Jack to see the Foreman.

The Foreman introduced Jack to his banksman and tells him to work with a small excavator called Alfie. Jack and Alfie were having fun until a dump truck named Max comes along and causes dust to fly over the machines. Jack could see that Thomas was right that he was trouble and Max was about to rush towards him, but stops just in time. Jack becomes furious, and, whilst refusing to move, scolds Max, who immediately races away in frustration.

Later, the foreman orders Oliver to move a pile of rocks, but Jack foolishly takes over, and picks some of the rock up a hill himself. His banksman tries to stop him, but Jack refuses to do so as he was too eager too help. Unfortunately when he approaches the top of the hill, he loses his balance, overturns, and slides sideways downhill.

Once back upright, Miss Jenny is glad Jack was luckily unhurt but was disappointed of his foolishness due to disobeying her "Safety First" rule, meaning no one should jump in where they shouldn't belong. Miss Jenny then thinks he may not be ready to join The Pack but gives Jack another chance to make sure he could do better the following day. After Miss Jenny leaves, Jack feels bad for what he had done, but Isobella, Alfie and Thomas console him, which makes him feel better.




  • This is the first episode directed by Steve Asquith.
  • The working title for this episode is "Jack Goes to Work".
  • Thomas is given a large scale model for the first time.
  • When Max does a 180 turn, a turntable is used to spin him.
  • The Italian title is "Jack Arrives". In Japan, this episode is called "Jack was Too Much". It is called "Work for Jack" in Welsh.
  • Alec Baldwin's narration has only been broadcast on Sprout.
  • In Michael Angelis' US narration, the foreman doesn't say "and" when he tells Jack to help Alfie.


  • Thomas leaves with the wellwagon after delivering Jack, but in the close-up of Jack the wellwagon is still behind him.
  • Studio equipment can be seen in the top-right corner when the narrator says "Byron the bulldozer was shoving rock and rubble with his giant blade".
  • When the foreman introduces himself to Jack, he has a moustache, red hair and a hat. When he says "Oliver, move this rock!" he has a hard hat and no moustache.
  • Oliver should not have moved his scoop while moving at such a speed when near workers.
  • How would Jack know which machines Byron and Alfie were?
  • When Jack introduces himself to Alfie, Alfie's front-left tire is flat.
  • When Max arrives, he runs over some sort of platform.
  • In some shots, a wire is visible under Alfie's hydraulic arm.
  • When Isobella yells "No!" when Jack goes up the hill, wires can be seen in her cab.
  • Before Jack barrel-rolls down the hill, his two left wheels change colour.
  • None of the Pack have drivers. Their operators simply shout what to do.
  • When Miss Jenny says "We'll see if you can do better tomorrow," Oliver is smiling even though Jack is in trouble.


  • Jack: I'm Jack!
  • Isobella: Mind my paint!
  • Kelly: Isobella!
  • Isobella: Sorry. Welcome to The Pack.
  • Kelly: And if you want to help...
  • Isobella: See the foreman. He's in charge.


  • Jack: Stop bullying!
  • Max: Can't you take a joke?


  • Take Along (four-pack and movie car; both discontinued)

In Other Languages

Language Name Meaning
Japanese やりすぎたジャック Jack was Going too Far
Norwegian Jack stepper inn Jack Steps In
Italian Arriva Jack! Here Comes Jack!
Welsh Gwaith ar gyfer Jack Work for Jack
Dutch Jack Gaat aan het Werk Jack Goes to Work
Danish Jack hænger Jack Hangs In
Czech Honza jde do práce Jack goes to work
Russian Джек идет на работу Jack Goes to Work
Polish Jacek jedzie do pracy Jack Goes to Work
Slovenian Jaka priskoči na pomoč Jack Comes to Help
Swedish Jack rycker in Jack Snatches In
Romanian Jack Intra în Echipă Jack Joins the Team
Slovak Jack skáče Jack Jumps
Hungarian Jack Munkába Áll Jack's Job is to Work
Chinese 杰克的加入 Jack Was Added
Korean 일을 좋아하는 잭 Jack Likes to Work
Thai แจ็ครถตักอยากจะช่วย Jack Wants to Help the Loader

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