Thunderbirds (1965)

S1E7 30 Minutes After Noon

The Erdman Gang has created a clever method for executing their plans – a bomb-laden bracelet that can only be detached at a specific location. When a secret agent tries to penetrate their ranks, things take a disastrous turn, leaving him ensnared in a plutonium facility. Now, International Rescue must work against the clock to avert a catastrophic nuclear blast.