Dominic Monaghan (pictured inside; Lost) has landed the lead role in Edna McCallion’s psychological thriller Pet for MGM. Monaghan will play Seth, a man who bumps into his old high school crush and quickly becomes obsessed with her. He takes her captive underneath the animal shelter where he works but soon suspects that his old flame is not who she seems to be. Monaghan will star with Ron Perlman in Glenn McQuaid’s period zombie flick I Sell the Dead for Glass Eye Pix. “Pet,” set to begin shooting in the next few months.