All of you who have been dying for more "Exposure," circle Monday, April 8, on your calendar - that's the day the wonderful series "Northern Exposure" returns to CBS. Finally.

Introduced this past summer, it's the story of a young, New York doctor named Joel Fleischman (Rob Morrow). His training was paid for by the state of Alaska, and in return he promises to practice in the state for five years.Joel expects to be working in Anchorage, but he ends up being sent - much against his will - to a tiny frontier town. The town's citizens include a tough female bush pilot (Janine Turner), a millionaire ex-astronaut (Barry Corbin) and an guileless young Indian (Darren E. Burrows).

It's not a medical drama, it's a fish-out-of-water story.

For those of you who haven't seen the show, don't expect non-stop action, or lots of hysterical one-liners or earth-shattering issues.

Just expect believable, well-drawn characters, humor, good writing, good acting and good directing.

ANTAGONISTIC: CBS will also debut a new courtroom drama series titled "The Antagonists" as a movie on Tuesday, March 26, before moving the series to its regular time slot on Thursday, March 28, at 8 p.m.

"The Antagonists" is about "the volatile personal friendship between a smart, straight-laced female prosecutor (Lauren Holly) and a flamboyant, unpredictable male attorney (David Andrews)."

OTHER CBS CHANGES: "The Flash" moves to Saturdays at 7 p.m. on April 6 . . . "Top Cops" expands to an hour (7 p.m.-8 p.m.) as of Thursday, March 28.

Meanwhile, "Good Sports" is scheduled for a single airing on Monday, March 18, at 9 p.m., but the network has no plans right now to air any further episodes . . . There's also no word on the status of either "Uncle Buck" or "Lenny," but don't expect to see either weak show soon . . . "The Trials of Rosie O'Neill" will eventually be back in a new time slot.

NBC CHANGES: "Sunday Best" is dead - it's been replaced on Sundays at 6 p.m. by "Super Bloopers & Practical Jokes" . . . "Dear John" has returned to Wednesdays at 8:30 p.m. . . . "Seinfeld" will move to Thursdays at 8:30 p.m. on April 4, replacing "Wings" (which runs out of new episodes but will return later) . . . "Dark Shadows" completes its run on Friday, March 22, (it might return, but chances are slim) . . . "Midnight Caller" returns to Fridays at 9 p.m. time slot on March 29.