The asali rubutun da aka rubuta ta Dan Gilroy da aka saya ta hanyar DreamWorks ga $850,000 a 2003 ko 2005 (sources bambanta). A aikin ya kasance daya daga 17 cewa DreamWorks dauki daga Paramount Pictures a lõkacin da suka raba a 2008. Darektan Peter Berg bayyana sha'awa a cikin aikin a tsakiyar shekara ta 2009, amma ya tafi ba kara. Levy aka a haɗe da aikin a watan Satumba na 2009, kuma Jackman aka jefa a cikin starring rawa a watan Nuwamba ga wani $9 miliyan fee. A wannan watan, Steven Spielberg da kuma Stacey Snider a DreamWorks greenlit aikin. Les Bohem da kuma Jeremy Leven ya yi aiki a kan Gilroy ta screenplay, amma a shekarar 2009 John Mathins aka aiki a kan wani sabon screenplay. A lokacin da Levy shiga aikin, ya yi aiki tare da DreamWorks sake dubawa da jimillar shida makonni na fina-finai, DreamWorks dauki daga Paramount Pictures a lokacin da suka raba a watan Oktoba 2008.
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