sceneivorous 

One whose primary source of nutrition is the scenery whlie acting. While some actors may be accused of chewing the scenery in a particular scene, a sceneivorous actor has now evolved into a creature with no other sustenance for his career.

Reference "herbivorous/carnivorous" - plant-eating and meat-eating - as well as "chewing the scenery" as a pre-defined and common critical term for way overdoing it in a performance.

At the beginning of his career, actor Al Pacino had a light touch and subtle turns in his film work, but lately he has been exclusively sceneivorous.

The actress had trouble being noticed in her big moment when her sceneivorous costar kept hogging the focus of the audience.

sceneivorous by Cinerina.com March 20, 2010