His snowy hair is styled like a lazy Shih Tzu atop his head. His carefully mowed goatee clings to his chin like a milk stain. And his eyebrows wriggle amid all this whiteness like a pair of furry brown caterpillars. He is Sam Elliott, actor, laconic tough guy, eighth wonder of the hair world.
He is also the star of TNT's ''Avenger," a movie that offers more coiffure intrigue than suspense. ''Avenger," which premieres tomorrow night at 8, is a sloppy tale of international vengeance that inspires a big old-fashioned ''Huh?" The plotting is so nonsensical you'll have to work to keep yourself from thinking -- if you don't change the channel, of course. Characters magically appear in different locales, Elliott's Cal Dexter miraculously figures out everything 25 steps ahead of the bad guys, and relationships are never quite explained. It's all just so many pieces of a puzzle tossed onto a table with no possibility of interlocking.