 Two re @-@ edited series , based on <unk> versions of 13 of the original episodes , aired in the US in 1994 . The first , Thunderbirds USA , was broadcast as part of the Fox Kids programming block ; the second , <unk> Thunderbirds , was syndicated by UPN . Developed as a comedy , <unk> Thunderbirds moved the action to the planet " Thunder @-@ World " and combined the original puppet footage with new live @-@ action scenes featuring a pair of human teenagers . 
