Shameless (U.S. TV series) does not air on Showtime.
Since at least the 2000s, new broadcast television series are often ordered (funded) for just the first 10 to 13 episodes, to gauge audience interest
 Canadian shows do not normally receive "back nine" extensions within the same season, however; even a popular series simply ends for the year when the original production order has finished airing, and an expanded order of more than 13 episodes is applied to the next season's renewal order rather than an extension of the current season

