▁influence ▁on ▁the ▁screen play ▁for ▁this ▁film , ▁and ▁although ▁the ▁prem ise ▁remains , ▁it ▁devi ates ▁from ▁the ▁novel ▁in ▁several ▁ways , ▁removing ▁the ▁inf ected ▁people ' s ▁v amp ir ic ▁characteristics , ▁except ▁their ▁sens itivity ▁to ▁light . ▁In ▁this ▁version , ▁the ▁inf ected ▁are ▁port rayed ▁as ▁no ct urn al , ▁black - ro bed , ▁alb ino ▁mut ants , ▁known ▁as ▁the ▁Family . ▁Though ▁intellig ent , ▁they ▁es ch ew ▁modern ▁technology , ▁bel ieving ▁it ▁( and ▁those ▁who ▁use ▁it , ▁such ▁as ▁Ne ville ) ▁to ▁be ▁evil ▁and ▁the ▁cause ▁of ▁human ity ' s ▁down fall . ▁ ▁I ▁Am ▁Leg end ▁ ▁In ▁ 2 0 0 7 , ▁a ▁third ▁adaptation ▁of ▁the ▁novel ▁was ▁produced , ▁this ▁time ▁titled ▁I ▁Am ▁Leg end . ▁Direct ed ▁by ▁Francis ▁Lawrence ▁and ▁st arring ▁Will ▁Smith ▁as ▁Robert ▁Ne ville , ▁this ▁film ▁uses ▁both ▁Math es on ' s ▁novel ▁and ▁the ▁ 1 9 7 1 ▁Om ega ▁Man ▁film ▁as ▁its ▁sources . ▁This ▁adaptation ▁also ▁devi ates ▁significantly ▁from ▁the ▁novel . ▁In ▁this ▁version , ▁the ▁in fection ▁is ▁caused ▁by ▁a ▁virus ▁originally ▁intended ▁to ▁c ure ▁cancer . ▁Some ▁v amp ir ic ▁elements ▁are ▁retained , ▁such ▁as ▁sens itivity ▁to ▁U V ▁light ▁and ▁att raction ▁to ▁blood . ▁The ▁inf ected ▁are ▁port rayed ▁as ▁no ct urn al , ▁fer al