The One with... the oil rig.
Jeff Tracy takes a well-earned rest at Lady Penelope Creighton-Ward's Australian sheep ranch, leaving Scott in charge. When World Navy torpedo tests ignite an undersea gas field, Scott sends in the Thunderbirds - much to Jeff's disappointment. While Lady Penelope forestalls Jeff's inital plan to return home directly, Scott finds the weight of command ever more heavily in his absence - especially when the field reignites, and places the vast Seascape rig in immediate peril...
- Borrowed Catchphrase: Scott gets a chance to proclaim that "Thunderbirds are go!"
- Broken Aesop: Supposedly Scott learns that being in charge is harder than it looks. In reality, Scott is a good leader his only problem is that his father doesn't back him up.
- The Chains of Commanding
- Everybody Laughs Ending
- Ironic Echo Cut: Twice.
- First, as Jeff hears on the radio about the first flare threatening the oil rig, he calmly states that he trusts Scott not to interfere, as "this is not a job for International Rescue". Cut to Scott saying: "This is a job for International Rescue!"
- Later, Jeff is rushing home in his plane, as he (mistakenly) believes he is needed. Desperately, he mumbles "come on baby... faster... faster...". Cut to Gordon saying the same thing to TB 4's laser device.
- Militaries Are Useless: Played straight when a military torpedo goes rogue, causing the underwater explosions that threaten the oil rig. Later averted when the same navy helps evacuate the personnel from the oil rig.
- Stuff Blowing Up: Wouldn't be a Thunderbirds episode without it, but it's taken to truly ridiculous extremes here with the ocean itself burning and exploding.
- Vacation Episode: The story is kickstarted by Jeff being talked into a holiday by Lady Penelope, leaving Scott in charge.
- Workaholic: Jeff is very reluctant to take a vacation. It takes the combined efforts of all other inhabitants of Tracy Island and Lady Penelope to convince him.