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Plot[]

It's Christmas time for the Octonauts as they travel to Professor Inkling's home, the seamount (an underwater mountain). However, when an undersea tremor shakes the seamount, Inkling discovers that his friends and nephew, Squirt, are trapped inside of it. Tweak sees the situation as the perfect opportunity to bring out Captain Barnacles' present, the Gup-X, the strongest GUP she’s made yet. The 500 year-old Golden Coral is also trapped, and she thinks she'll be spending Christmas upside-down. When they get to the top, the golden coral gathers up in the center and several sea creatures come together to form a Christmas tree, and everyone sings.

Characters[]

Trivia[]

  • This is the last episode to use the original intro from 2010.
  • This is the second episode to debut a brand new Gup - The Gup X.
  • This is the first Christmas episode, and also doubles as the first episode celebrating a holiday.
  • The Golden Coral is mentioned and only seen in this episode.
  • This is the second 20-minute episode of the series, with the first being The Great Penguin Race.
  • This is the final episode where Jaimie Kelton voices Tweak in the US. Jo Wyatt, who had voiced the character in the UK since the first episode, would take over as Tweak in the US dub from Season 2 onwards.
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