- NHL playoffs (5:30 p.m., ESPN): Buffalo Sabres at Washington Capitals.

- 7th Heaven (7 and 8 p.m., Ch. 30): In the first episode, Simon is worried about school and Mary is worried about basketball. In the second episode, Eric and Annie renew their wedding vows. (Repeats)- Ally McBeal (8 p.m., Ch. 13): Ally isn't happy when she is assigned to defend Richard against charges he solicited a prostitute. (Repeat)

- 20/20 (8 p.m., Ch. 4): A report on how to find low airfares.

- The Practice (9 p.m., Ch. 4): Bobby gets involved with a client - a woman accused of murder. (Repeat)

- Dateline NBC (9 p.m., Ch. 5): A report on a woman who was dismissed from the Air Force after charges of adultery.

- People Century: 1900-1999 (9 p.m., Ch. 7): "On the Line" looks at the rise of the assembly line, mass production and the consumer society it created.

Lame ducks

- A pair of shows that CBS has canceled temporarily return to the network's lineup tonight - and both are cases of good shows gone bad. Cybill (8 p.m., Ch. 2) started out as a light-hearted, entertaining half-hour that was more than a bit over-the-top but had great camaraderie between Cybill (Cybill Shepherd) and Maryann (Christine Baranski). But it degenerated far too quickly into crude banality, mistaking tasteless for funny.

Thank goodness George & Leo (8:30 p.m., Ch. 2) didn't sink that low. But after a great start it quickly became obvious the writers had no idea what to do next and wasted the talents of Bob Newhart and Judd Hirsch. While the departure of "Cybill" will come as a relief, "George & Leo's" demise is more melancholy because of the show that might have been.