 In 1993 , Feldman reworked his ideas into a spec script . This was sent to producer Frank Mancuso , Jr . , who had hired Feldman to adapt Sidney Kirkpatrick 's A Cast of Killers . The producer got attracted to the creative possibilites as the film offered " the challenge of walking that fine line between believability and pushing something as far as it can go . " Metro @-@ Goldwyn @-@ Mayer got interested on the project , and while Feldman had some initial disagreements on the budget , after considering other studios he signed with MGM . In turn , the now retitled Species attracted director Roger Donaldson , who was attracted to its blend of science fiction and thriller . The script underwent eight different drafts , written over an eight @-@ month period , before Donaldson was content that flaws in the story 's logic had been corrected . At one point another writer , Larry Gross , tried his hand with the script , but ultimately all the work was done by Feldman . Feldman would remain as a co @-@ producer . While the initial Species script suggested a love triangle between Sil and two government team members , the dissatisfaction of the crew eventually led to changes to the ending , which ended up featuring Sil having a baby that would immediately prove dangerous . 
 In 1993 , Feldman reworked his ideas into a spec script . This was sent to producer Frank Mancuso , Jr . , <a href='null_relcl' title='1'><mark>who</mark></a><a href='been_done' title='2'><mark>had</mark></a> hired Feldman to adapt Sidney Kirkpatrick <a href='null_genetive' title='3'><mark>'s</mark></a>A Cast of Killers . The producer got attracted to the creative possibilites as the film offered " the challenge of walking that fine line between believability and pushing something as far as it can go . " Metro @-@ Goldwyn @-@ Mayer got interested on the project , and while Feldman had some initial disagreements on the budget , after considering other studios he signed with MGM . In turn , the now retitled Species attracted director Roger Donaldson , <a href='null_relcl' title='4'><mark>who</mark></a>was attracted to its blend of science fiction and thriller . The script underwent eight different drafts , written over an eight @-@ month period , before Donaldson was content <a href='null_relcl' title='5'><mark>that</mark></a>flaws in the story <a href='null_genetive' title='6'><mark>'s</mark></a>logic <a href='been_done' title='7'><mark>had</mark></a> been corrected . At one point another writer , Larry Gross , tried his hand with the script , but ultimately all the work was done by Feldman . Feldman would remain as a co @-@ producer . While the initial Species script suggested a love triangle between Sil and two government team members , the dissatisfaction of the crew eventually led to changes to the ending , which ended up featuring Sil having a baby <a href='null_relcl' title='8'><mark>that</mark></a>would immediately prove dangerous . 
In 1993 , Feldman reworked his ideas into a spec script . This was sent to producer Frank Mancuso , Jr . , done hired Feldman to adapt Sidney Kirkpatrick  A Cast of Killers . da producer got attracted to tdacreative possibilites as thdailm offered " the challenge of walking dat fine line between believability and pushing somthin as far as it can go . " Metro @-@ Goldwyn @-@ Mayer got interested on thedaoject , and while Feldman had sum initial disagreements on the budget , after considering other studios he signed witt MGM . In turn , the now retitled Species attracted director Roger Donaldson , was attracted to its blend of science fiction and thriller . The script underwent eight different drafts , written ova an eight @-@ month period , b4 Donaldson was content flaws in the story  logic done been corrected . At one point another writer , Larry Gross , tried his hand w the daipt , but ultimately alll the wda was done by Feldman . Feldman would remain as a co @-@ producer . While the initial Species script suggested a love triangle between Sil and 2 government team members , the dissatisfaction of the crew eventually led to changes to the ending , which ended up featuring Sil having a baby would immediately prove dangerous .