* "National League baseball playoffs" (8 p.m.-conclusion, WBAL, Channel 11) -- Game 2 of the NL play- offs, after which the Philadelphia Phillies give up home-field advantage and move on, with the Braves, to Atlanta. CBS.
* "The Simpsons" (8-8:30 p.m., WBFF, Channel 45) -- Kelsey Grammer appears -- or, more accurately, his voice does -- on two different comedies tonight. Once again, Grammer drops in on "The Simpsons" to provide the voice of Sideshow Bob, the deranged sidekick of Krusty the Clown. Fox.
* "Seinfeld" (9-9:30 p.m., WMAR, Channel 2) -- Having lost out on one of the cushiest jobs of all time when an iron injury ruined his career as a "hand model," George (Jason Alexander) gets all passionate about his next employment opportunity. Meanwhile, Jerry (Jerry Seinfeld) has a hard time accounting for the behavior of his accountant. NBC.
* "Mystery!: 'Final Curtain' " (9-10 p.m., WMPT, channels 22 and 67) -- "Mystery!" begins its 14th season by showcasing a trio of British "Chief Inspector Alleyn" telemovies, presented here as individual two-part mysteries. The best news here is that Alleyn is played by Patrick Malahide, who played the nemesis of "The Singing Detective" in that fabulous Dennis Potter miniseries. PBS.
* "Frasier" (9:30-10 p.m., WMAR, Channel 2) -- Frasier (Kelsey Grammer again) gets angry when a newspaper critic says something awful about his show. Must have been someone else, because I love it. NBC.
* "Late Show With David Letterman" (11:35 p.m.-12:35 a.m., WNUV, Channel 54) -- For the potential to see a show spin madly out of control, but with the host's willing complicity, here's the place. Not content with having played host to the uncontrollable Jerry Lewis, Mr. Letterman tonight makes room for . . . Don Rickles.
* "Gas Food Lodging" (10:30 p.m.-12:15 a.m., SHO) -- Good, strange performances from Ione Skye and Fairuza Balk, make this 1992 drama a surprisingly memorable little film.
A TV critic at the New York Daily News, David Bianculli also contributes to the Philadelphia Inquirer and the Fort Worth Star-Telegram.