The first two episodes of the fourth season of USA Network's spy series "La Femme Nikita" arrive Sunday at 9.

In the series, a squad of black-clad agents work for Section One, combatting terrorism by using every high-tech gadget they can get their hands on. And the secret weapon of the group is the tough, buff and beautiful Nikita -- played by Peta Wilson -- who has sacrificed a normal life to carry out these covert duties because she was wrongly convicted of a heinous crime and given a new identity in exchange for her life.

At the end of season three, Nikita and Michael, having fallen in love, planned a coup against their bosses at Section One. But this was discovered and Nikita was brainwashed by her superiors. Sunday, we find out if Nikita has become an emotionless killing machine, while Michael starts an investigation into how he can undo what was done to her.

* Sunday on Sci-Fi Channel at

7 p.m., "First Wave" rolls in for a second wave with Rena Mero (former WWF sensation Sable) guesting as the series begins its second year on a new night and a new time. Repeats at 10 p.m.

* Sunday on Showtime at 8 p.m., the final Broadway performance of Arthur Miller's Pulitzer Prize-winning play "Death of a Salesman," starring Brian Dennehy and Elizabeth Franz. Repeats Wednesday at 7 p.m.

* Sunday on Fox Family Channel at 8 p.m., the premiere of the television movie "Britannic," based on the true story of Titanic's sister ship, bigger and supposedly safer, which sank under mysterious circumstances in 1916, four years after Titanic. Repeats at 10 p.m., Saturday at 8 p.m., and Jan. 18 at 8 p.m.

* Monday through Thursday on the History Channel at 9 p.m., "History Alive" goes behind the cold walls of America's most feared prisons in the four-part "The Big House" series: Attica Prison on Monday, Alcatraz on Tuesday, McNeil Island on Wednesday and Angola on Thursday. Repeats nightly at 1 a.m. All four parts air Sunday, Jan. 16, 3-7 p.m.

* Tuesday on A&E Network at 8 p.m., "Biography" profiles Redd Foxx, the comic who spent 40 years on the black nightclub circuit before hitting it big on the television series "Sanford & Son" -- his real name was Jon Sanford. His generosity and hard living led to bankruptcy in the 1980s.

* Tuesday on the History Channel at 10 p.m., "Modern Marvels" premieres "The Chunnel" episode with the story of the challenge this project presented for those who sought to link Britain and France. Repeats at 2 a.m.

* Wednesday on TBS at 8:05 p.m., the premiere of the new original series "Ripley's Believe It or Not!," venturing into the world of strange and fascinating phenomena, stretching the limits of imagination. This series began as a cartoon in New York's Globe in 1918.

* Wednesday on TNN at 9 p.m., "Diet Coke guy" Lucky Vanous stars as a driver of a high-tech 18-wheel Kenworth T2000 and a special agent for the Department of Justice in "18 Wheels of Justice," the Nashville Network's first action drama series.

Billy Dee Williams, G. Gordon Liddy and Lisa Thornhill co-star in the series that will air weekly at the same time.

* Wednesday on Comedy Central at 10:30 p.m., Steve Allen, Robin Williams, Sid Caesar and Robert Wuhl help "Celebrate the Humor of Jonathan Winters" at the Kennedy Center when he is presented with the Mark Twain Prize. Encores Jan. 16, 21 and 22.

* Friday on Fox Family Channel at 9 p.m., the debut of the series "Higher Ground" with Joe Lando in an action drama about a school for troubled teens in the Pacific Northwest. The second hour of the premiere episode airs Wednesday, Jan. 19, at 10 p.m.