 Tony Barwick , who had impressed Pattillo and the Andersons with an unsubmitted script that he had written for Danger Man , was recruited to assist in the writing of subplots and filler material . He found that the longer format created opportunities to strengthen the characterisation . Science @-@ fiction writer John Peel suggests that " small character touches " make the puppet cast of Thunderbirds " much more rounded " than those of earlier APF series . He compares the writing favourably to that of live @-@ action drama . The new footage proved useful during the development of the first series finale , " Security Hazard " : since the previous two episodes had overspent their budgets , Pattillo devised a flashback @-@ dominated clip show containing only 17 minutes of new material to reduce costs . 
 Tony Barwick , <a href='null_relcl' title='1'><mark>who</mark></a><a href='been_done' title='2'><mark>had</mark></a> impressed Pattillo and the Andersons with an unsubmitted script <a href='null_relcl' title='3'><mark>that</mark></a>he <a href='been_done' title='4'><mark>had</mark></a> written for Danger Man , was recruited to assist in the writing of subplots and filler material . He found that the longer format created opportunities to strengthen the characterisation . Science @-@ fiction writer John Peel <a href='uninflect' title='5'><mark>suggests</mark></a> that " small character touches " make the puppet cast of Thunderbirds " much more rounded " than those of earlier APF series . He <a href='uninflect' title='6'><mark>compares</mark></a> the writing favourably to that of live @-@ action drama . The new footage proved useful during the development of the first series finale , " Security Hazard " : since the previous two episodes <a href='been_done' title='7'><mark>had</mark></a> overspent their budgets , Pattillo devised a flashback @-@ dominated clip show containing only 17 minutes of new material to reduce costs . 
Tony Barwick , done impressed Pattillo and da Andersons with an unsubmitted script he done written for Danger Man , was recruited to assist in the writing of subplots and filler material . He found dat the longer format created opportunities to strengthen the characterisation . Science @-@ fiction writer John Peel suggest tdat" small character touches " make tdapuppet cast of Thunderbirds " much more rounded " than those of earlier APF series . He compare the writing favourably to that of live @-@ action drama . Thdaew footage proved useful durin the development of thedarst series finale , " Security Hazard " : since the davious two episodes done overspent their budgets , Pattillo devised a flashback @-@ dominated clip show containing only 17 min of new material to reduce costs .