Looking for HBO or Showtime? They're just some of the Comcast premium channels you can add to your subscription.
How it works
Premium channels on Comcast include related multiplex channels at no additional cost. When you subscribe to a Premium channel, the multiplexes become part of your TV listing and you’ll have access to that premium channel's On Demand programming.
Comcast premium channels and multiplexes:
The Movie Channel
The Movie Channel Xtra
Note: Premium channel multiplex channels are not available in some areas.