Thun ‧ der ‧ birds /ˈθʌndəbɜːdz $ -dərbɜːrdz/ BrE AmE trademark
a 1960s British television programme for children in which the main characters, played by ↑ puppet s , are brothers who work for an organization called International Rescue and save people in danger using special aircraft and other vehicles, called Thunderbird 1, Thunderbird 2 etc. The programme begins with the words ‘Thunderbirds are go!’