Doctor Who (6:30 and 9 p.m., Sci Fi): In the fourth-season premiere (which is, oddly enough, a Christmas episode) the Doctor tries to save the people on board the Titanic an orbiting cruise ship.
Desperate Housewives (7 p.m., Ch. 4): If you missed Sunday's very good episode, ABC repeats it tonight.
College softball (7 p.m., Ch. 11 and BYUTV): Utah at BYU
Battlestar Galactica (8 and 10:30 p.m., Sci Fi): Starbuck heads off in search of Earth, and the Cylons face a threat from within.
Canterbury's Law (8 p.m., Ch. 13): Elizabeth tries to avoid defending a confessed rapist. This is the season finale and given the low ratings it's probably the finale, period.
20/20 (9 p.m., Ch. 4): A report titled Your Weather: Myths, Lies and Downright Stupidity.