TONIGHT'S MUST-SEE

"Eureka," 4 p.m.; "Stargate SG-1," 6 p.m.; and "Stargate: Atlantis," 7 p.m., all Sci Fi Channel. If you didn't catch Tuesday's dandy debut of "Eureka," here's another chance. A straight-arrow, straightlaced U.S. marshal wanders into a tiny town that's filled with odd geniuses. Afterward, settle in for the two new "Stargate" hours. The first takes the crew to a planet where a sleeping sickness takes lives. The second hour gives the "Atlantis" people a crisis: They lack the manpower to watch the Wraith prisoners who have been transformed into temporary human-types.

OF NOTE

"24," 8 p.m., Fox. CTU deals with the aftermath of a terrorist attack.

"NCIS," 7 p.m., CBS. A drug dealer dies while in an elevator with Ziva. That makes her a prime suspect.

"Sexual Healing" debut, 7 p.m., Showtime. In the opener, we see relationship expert Laura Berman work with three couples who are having sexual problems. Each couple brings a sense of sadness. We get few glimpses of warmth or joy. The result is sometimes frank but rarely interesting.

"Read It and Weep," 8 p.m., Disney Channel. The Panabaker sisters star. Kay is 16 and played Nikki in the "Summerland" series; Danielle is 18 and starred in "Mom at Sixteen" and "Searching for David's Heart." In the movie, a regular teen (Kay) fills her journal with the exploits of her alter ego (Danielle); then the journal becomes a best-seller.

"Kyle XY," 8 p.m., ABC. In a quick rerun of Monday's episode on cable's ABC Family, Kyle is falling for the neighbor girl; Lori and Josh face other romantic problems.

"Numb3rs," 9 p.m., CBS. An Iraqi woman is killed after coming to the U.S. for a women's rights documentary.

"Law & Order," 9 p.m., NBC. A military contractor has been killed in New York, but that may relate to his work in Iraq.