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"Growing Pains" is the fifth episode of Thunderbirds Are Go! season 3. It was broadcast on April 28, 2018, in the UK.


The Chaos Crew interrupts the pleasant and quiet life of Ned Tedford, to steal the orchard growth serum inside the highly- secure Global Seed Vault. Kayo and Captain Rigby respond, with the help of John Tracy, but things take a turn when a computer virus infects EOS and the serum touches Ned's pet geranium, Gladys - turning her into Giant Gladys!


Regular Cast

Guest Cast


John: "Ready for your first mission in the field, EOS?"
EOS: "Is my program backed up in case something goes wrong?"
John: "That's just a growth serum in a seed vault. What could possibly go wrong?"
EOS: "John..."
John: "Yes, you're backed up. We need to work on your sense of humor."

International Rescue Equipment Used

Non-International Rescue Equipment Used



  • This episode borrows plot points from both the Thunderbirds 2086 episode Kudzilla and the classic episode Attack of the Alligators!
  • It's also a continuation of Attack of the Reptiles.
  • This episode features several series "firsts":
    • First to feature the Chaos Crew, without The Hood.
    • The first time someone other than Kayo drives Thunderbird Shadow.
    • And the first in which Thunderbird 5 is the only Thunderbird craft from the original series to appear in the story (except for the opening and closing credits).
    • This is the first time we see a EOS-drive.
      • Therefore this episode marks the first - and, to date, only - assignment for EOS as a member of International Rescue
  • Speaking of TB5 - its Space Elevator is shown landing somewhere other than at Tracy Island.
  • This is the third episode to only feature one member of the Tracy family; this time, it's John.
  • Sadly, this episode features the first - and, to date, only - on-screen ‘death’ of a character in the reboot series...since poor Gladys is unfortunately destroyed as a result of the growth serum.
    • As such, it is, rather appropriately, the final appearance of Ned in the series.
  • The Global Seed Vault was probably inspired by The Svalbard Global Seed Vault located in Svalbard.


  • Kayo tells Rigby that to activate the scanner he must press the top button on the right; however, there are two buttons.
  • Whilst saving Ned, John's voice is swapped with Rigby's voice by mistake.