This is really old, but I don't remember seeing it posted here and I searched and couldn't find it. Article about whether or not actors get paid for episodes that they don't even act in, using 'House MD' as an example.
Dr. Gregory House has found a friend! Someone he can come home to and catch rummaging through his closets. Lucas the PI (Michael Weston) is a costly friend, but sometimes though those are the truer friends to have.