K.C. ALFRED / Union-Tribune

Babies, it's cold outside. Metaphorically, if not meteorologically. What with the chill of global warming and the Wall Street meltdown and everything. But fear not, our shivering friends. While the outside world feels as welcoming as a meat locker, your own corner of the universe can be a cozy as you need it to be. And the emotional thermostat is in your hands.

Showtime's “Dexter” (9 p.m. Sundays) is back, and, once again, it's an opportunity to observe the superb Michael C. Hall, eerie blood spatter expert for the Miami P.D., who splatters the screen with the gruesome task of meting out deadly justice to those who deserve it.