Lost some of those excess pounds Matthew?

Transformation ... Matthew Fox

MATTHEW Fox appears to have Lost his good looks in this shocking shot from his new movie.

The star of the long-running TV drama is unrecognisable with bulging, sinewy muscles, tattoos and a shaved head as he pulverises a victim in a cage fight. 

The 47-year-old has transformed himself into a muscle-bound killing machine for his role in Alex Cross, an adaptation of a James Patterson novel. 

Another shot shows him with outstretched arms, showing his extensive body art, as he holds a gun. 

Tyler Perry stars as detective Alex Cross, who vows to track down the brutal killer of a family member.

Chilling ... Matthew Fox

His investigation soon uncovers similar crimes as he gets closer to the dangerous murderer, known as Picasso. 

It’s a far cry from the amiable, slightly chubby, heartthrob Jack Shepherd, the character Matthew played in Lost until 2010. 

And that could make his female fans Cross.

Beach body ... Matthew in Lost