 Widely considered to be the Andersons ' most popular and commercially successful series , Thunderbirds has received particular praise for its effects ( directed by Derek Meddings ) and musical score ( composed by Barry Gray ) . It is also well remembered for its title sequence , which opens with an often @-@ quoted countdown by actor Peter Dyneley ( who voiced the character of Jeff ) : " 5 , 4 , 3 , 2 , 1 : Thunderbirds Are Go ! " A real @-@ life rescue service , the International Rescue Corps , is named after the organisation featured in the series . 
 Widely considered to be the Andersons <a href='null_genetive' title='1'><mark>'</mark></a>most popular and commercially successful series , Thunderbirds <a href='been_done' title='2'><mark>has</mark></a> received particular praise for its effects ( directed by Derek Meddings ) and musical score ( composed by Barry Gray ) . It <a href='drop_aux' title='3'><mark>is</mark></a>also well remembered for its title sequence , which <a href='uninflect' title='4'><mark>opens</mark></a> with an often @-@ quoted countdown by actor Peter Dyneley ( <a href='null_relcl' title='5'><mark>who</mark></a>voiced the character of Jeff ) : " 5 , 4 , 3 , 2 , 1 : Thunderbirds Are Go ! " A real @-@ life rescue service , the International Rescue Corps , is named after the organisation featured in the series . 
Widely considered to be the Andersons  most popular and commercially successful series , Thunderbirds done received particular praise for its effects ( directed by Derek Meddings ) and musical score ( composed by Barry Gray ) . It also well remembered for its title sequence , which open with an often @-@ quoted countdown by actor Peter Dyneley ( voiced the character of Jeff ) : " 5 , 4 , 3 , 2 , 1 : Thunderbirds Are Go ! " A real @-@ life rescue service , da International Rescue Corps , is named after tdaorganisation featured in the series .