Popstar Sam 7 is playing at the theatre and it's up to Jubilee to get him there.
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Ernie dresses up in a suit of armour and gets stuck, before saving a maiden in distress.
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Ernie has a bad cold so he leaves Millie in charge of Mr Rails's surprise party plans
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The trains are excited to see their old friend Brooklyn, and US athlete Rocky Two Shoes.
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Pippa's cat Patch disappears during a thunderstorm, and there are other strange goings-on.
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A horticulturist brings a rare plant to the Underground that turns hands purple.
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The trains are excited about the arrival of champion ice skaters Sasha and Natasha.