What's up tonight? Not much.
* "General Hospital" (3-4 p.m., WJZ, Channel 13) -- Beginning today, Anthony Geary and Genie Francis are reunited as their old famous and familiar characters, Luke and Laura.
* "Diagnosis: Murder" (8-9 p.m., WBAL, Channel 11) -- This new Dick Van Dyke series opens with a memorable line of dialogue: A man in a confessional says ominously to the priest, "Forgive me, father, for YOU have sinned." Then it slips into more forgettable territory, casting Dick Van Dyke as a doctor who is equally passionate about medicine and mysteries -- and, somehow, equally devoted to both in terms of time and resources. "At times, all doctors have to be detectives," he says, and decides to solve any puzzling case that comes his way. It may seem a far-fetched premise for a series, but "Quincy, M.E." did the same thing, and all HIS patients were dead. CBS.
* "The Adventures of Brisco County, Jr." (8-9 p.m., WBFF, Channel 45) -- Jessica Tuck, who's clocked some good guest appearances in prime time this season (her "Dream On" role heading the list), chooses another good showcase, portraying a former girlfriend of Brisco's. Bruce Campbell stars. Fox.
* "The Return of Ironside" (9-11 p.m., WMAR, Channel 2) -- In the last year of his life, Raymond Burr managed to reprise both of his famous series roles. His final "Perry Mason" television movie will be televised next month by NBC, and he made this "Ironside" reunion television movie earlier in 1993. NBC.
* "Bob" (9-9:30 p.m., WBAL, Channel 11) -- This second episode of the new, and indeed improved, "Bob" has Pete (Jere Burns) denied the presidency of his mother's greeting-card company, but afforded the opportunity of dating the daughter of the new president. Which means, of course, that Bob (Bob Newhart) has to suffer through daughter Trisha (Cynthia Stevenson) suffering through a date with Pete. Betty White co-stars. CBS.
* "Superman marathon" (midnight-9:30 a.m., AMC) -- Up, Up and away. . . . Thirty-one of the original 1948 "Superman" serials are presented tonight, a super nostalgic treat.
* "The Evil Dead" (3-5 a.m., USA) -- Here's a heavily edited chance to see "Brisco County" star Bruce Campbell in the 1982 cult film that made him sort of a star -- and made director Sam Raimi sort of famous, at least in horror-movie circles.