In the fourth instalment of 'Thunderbirds Are 60' – 'Stand By For "ACTION!"' – we take an in-depth behind the scenes look at the production of "Trapped in the Sky" and the Supermarionation series' other early instalments. From puppet wire disasters, to a re-cast Tracy brother, and from plane crash special effects, to the unforgettable music of Barry Gray, join the cult classic's cast and crew as they look back on an incredibly creative period – with contributions from Sylvia Anderson (Co-Creator and voice of Lady Penelope), Gerry Anderson (Co-Creator), Derek Meddings (Special Effects), David Graham (Parker, Brains), Shane Rimmer (Scott Tracy), David Elliott (Director), Matt Zimmerman (Alan Tracy), Keith Wilson (Art Department), Mary Turner (Puppet Department), Alan Patillo (Director and Writer) and more.