- "We don't take money. We just save people..."
Tony Williams lives with his brother, Bob Williams, at Charity Springs in the Northern Territory of Australia - where their father, Mr. Williams, runs Dunsley Tracker, a remote weather station (in actuality, a top-secret tracking facility for military satellites)
He and Bob are both big fans of "Internashnul Rescue" (as they call it), and emulating their Thunderbirds heroes is their favourite pastime. They've established their own secret base and fashioned homemade IR sashes and rescue equipment; and, with working walkie-talkies made by their father, they take turns playing at being rescuer and rescued.
But the game spirals out of control one day, when a call for help transmitted over the walkie-talkies accidentally summons the real International Rescue...
At the beginning of the episode, Bob lowers himself on a cliff-ledge and calls up International Rescue on his walkie-talkie, telling them "he has broken his leg." His brother Tony arrives in his Go-Kart painted green and dubbed on the side "Thunderbird 2."
A Trip to Tracy Island
Flown to Tracy Island aboard Thunderbird 1, Tony and his brother are given a tour of Thunderbird 2's hangar and Thunderbird 3's silo, before sitting down to tea with Jeff.
Trapped in a Mine
It's Tony's turn to get rescued, so after telling Dad he is going up to the old mine, he sets off on foot, telling Bob to give him 30 minutes' head-start.
On arrival at the mine, the Hood, disguised as a surveyor, gets Tony to tell him where his father is and advises Tony to hide in the mine.
Later he and his brother get trapped in an abandoned tin mine after The Hood deliberately blows up the entrance. International Rescue thinks it's another prank; and, at first, doesn't come to help...
Virgil and Alan - with radio assistance from Gordon - use Manual Descending Equipment to get down the mine shaft to rescue the boys, who are alive and well.
- It appears that Tony and his brother have been cutting out pictures from their issues of TV21 to decorate the walls of their playroom.
- The derelict blue pick-up truck seen at the old mine previously appeared in the Supercar episode Grounded.