 Scriptwriter Alex Garland (qv) acknowledges several sources as  inspiration for his screenplay, notably John Wyndhams  _Day of the Triffids, The (1962)_ (qv),  George A. Romero (I) (qv)s "Dead" trilogy (Night, Dawn and Day)  and _Omega Man, The (1971)_ (qv). Direct homages include Jim waking  up in the hospital from _Day of the Triffids, The (1962)_ (qv), the  chained infected being studied from _Day of the Dead (1985)_ (qv),  and the scene in the grocery store (people in the mall from  _Dawn of the Dead (1978)_ (qv)), the stop for supplies that saw a  run