There was nothing attractive about Gregory, the character Xander Berkeley currently plays on AMC's "The Walking Dead."In Berkeley's own words, Gregory is "narcissistic, egotistic, vainglorious, with a showman's big shell of bravado but with an empty locker of true grit and character. Someone whom life taught very bad lessons to, and is now having to face the real world at a stage when it may be too late for him to change his spots.