[MatrixDweller]

Regarding Alt vs Theatrical Ending:

When Will Smith's character, Neville, first catches the Dark Seeker in a trap the Dark Seeker that comes out into the sun for a few seconds is the same one that is after Neville the rest of the movie. That same Dark Seeker uses the same trap on Neville. Neville's comment that the Dark Seekers must have lost all semblance of humanity is not correct and the alternate ending drives this home. The theatrical ending abandons all the character build up regarding the Dark Seeker and the one Neville caught. It strays even further from the book and was a weak attempt to candy coat the whole movie with a happier ending.