Channel U

From publisher blurb:

Aliens, Dragons, Zombies!!! YOU are sitting at home flipping channels on the prototype television that your father's company invented, when you come across Channel U. In only an instant, you are pulled into the television and trapped inside. Now, you are the hero of the story and in order to escape back into reality, you must choose to be a captain on a starship and defeat a ruthless race of aliens, OR travel a medieval land and slay the fiercest dragon ever known, OR try to obtain the cure to save humanity from the zombie apocalypse. Your choices lead to 20 endings!