Aliens rule the airwaves Saturday, with a wealth of UFO-oriented programming, while on Sunday multiple airings of both "Deep Impact" and "Armageddon" exemplify science fiction's obsession with what happens when space rocks attack.

(all times Eastern)

12:00 AM The X-Files (FX) - Tunguska
The weasel-like Krycek returns, this time leading Scully and Mulder into a Russian trap involving the "black worm" form of the sinister oily aliens. Meanwhile, Marita, a/k/a Uniblonde, offers little help. (first part of two)

In their big screen debut, Scully and Mulder travel to the ends of the earth, from the deserts of Texas to the icy plains of Antarctica, out to stop the alien menace and menaced by FEMA and bees every step of the way.

12:30 AM Repo Man (Bravo)

Edgy comedy blending UFO paranoia, the web of synchronicity, mid-1980s Los Angeles and other strangeness, with Emilio Estevez, Harry Dean Stanton and a cameo appearance from punk band Circle Jerks.

1:30 AM Star Portal (Showtime)

Athena Massey plays a misunderstood vampiric alien -- she's only trying to help her people --in this film that features recycled footage from "Battle Beyond the Stars".

3:55 PM Stargate SG-1 (Showtime Beyond) - Dead Man's Switch

An alien bounty hunter captures the team!

7:00 AM Babylon 5 (TNT) - Whatever Happened to Mr. Garibaldi?
G'Kar, one of the few people to realize that Garibaldi is missing, gets captured for his trouble. Meanwhile, Sheridan hangs around with a big-foreheaded alien who seems reluctant to give anyone a straight answer.

8:00 AM Powers of Matthew Star (TVLand) - Daredevil
Matthew's obsession with Earth motorcycles lead him to use his powers to help a friend do some film stunts.

8:00 AM Babylon 5 (TNT) - The Summoning
Ivanova takes Marcus along in her attempt to make contact with the tiki-like First Ones, while Zack makes an unsettling discovery.

11:00 AM Mystery Science Theater 3000 (SciFi) - The Projected Man
Film centers on a money-hungry scientist left mutated and angry after a transporter accident. On the Satellite, Crow gains the power of life and death.

1:00 PM Dark Skies (SciFi) - Hostile Convergence

For summary information, see 12:00 AM listing.

4:15 PM Sphere (Cinemax)

Dustin Hoffman, Sharon Stone and Samuel L. Jackson star as researchers who go underwater to investigate a large golden sphere that could have alien origins. Based on the book by Michael Crichton.

5:40 PM Close Encounters of the Third Kind (Encore)

Musical aliens get up close and personal with Francois Truffaut (as a thinly-disguised Jacques Vallee), Richard Dreyfuss, Teri Garr, J. Allan Hynek and other Earth people, while "tinkerbell" brings up the rear. A classic example of Steven Spielberg's sensibilities circa 1977.

For summary information, see 2:00 AM listing.

10:45 PM The Outer Limits (Showtime Beyond) - Joy Ride

An aging space pilot causes his passengers distress by taking his vessel back to the strange zone that previously ruined his career.

10:50 PM Species II (TMC)

An astronaut undergoes a mating frenzy after being infected by alien DNA on Mars. The object of his attention: "Eve" (Natasha Henstridge), the rehabilitated alien/hybrid menace from the first film.

2:00 AM Alien Nation (Encore)

Mandy Patinkin is a Newcomer, an alien immigrant trying to make a fresh start on Earth. Naturally, he joins the Los Angeles police force, where he is partnered with James Kahn. Written by Rockne O'Bannon ('Farscape') and featuring Terence Stamp.

3:15 AM The Shadow Men (HBO)

Eric Roberts and Sherilyn Fenn seek the aid of an SF writer ( Dean Stockwell) after being abducted by aliens and chased by unsympathetic Men In Black.

3:35 AM Armageddon (Starz)

Bruce Willis, Ben Affleck and others swagger their way through the tough business of saving the world from a big meteor.

3:30 AM Star Trek: The Animated Series (TVLand)

No episode title available.

8:00 AM Powers of Matthew Star (TVLand) - The Racer's Edge
Matthew enjoys the pleasures of Earth's motorbike-racing industry, but terrorists loom.

8:00 AM Contact (HBO)

Aliens help an aloof astronomer (Jodie Foster) work through her unresolved father-daughter issues, while a wide-eyed Matthew McConaughey looks on in religious bewilderment. Also featuring James Woods, John Hurt and Tom Skerritt.

9:15 AM Deep Impact (Showtime Beyond)

A big comet threatens Tea Leoni, Robert Duvall and others in this film, which bears a curious resemblance to the legendary "When Worlds Collide."

10:00 AM Earth 2 (SciFi) - The Boy Who Would Be Terrian King

Terrorism and time-travel make uneasy bedfellows while Uly's life hangs in the balance.

11:00 AM Space: Above and Beyond (SciFi) - Mutiny
Ground troopers threaten to rebel over a cargo dispute.

12:00 PM Star Trek (SciFi) - The Way to Eden

Space hippies hijack the Enterprise to further their quasi-allegorical quest for a lost planetary paradise.

5:30 PM Lost in Space (Starz)

Bizarre Akiva Goldsman ("Batman & Robin") -scribed effort updates the campy 1960s adventures of the Robinsons, their Robot and the nefarious Doctor Smith. Despite the reassuring presence of Gary Oldman, Heather Graham and others, few were satisfied.

6:10 PM Deep Impact (Showtime Beyond)

For summary information, see 9:15 AM listing.

6:30 PM Contact (HBO)

For summary information, see 8:00 AM listing.

7:00 PM The Outer Limits (SciFi) - The Sandkings
Lloyd Bridges objects when Beau Bridges decides to keep a nasty alien ant farm in this adaptation of George R. R. Martin's incredibly creepy short story.

8:00 PM Armageddon (Starz)

For summary information, see 3:35 AM listing.

10:30 PM Stargate: SG-1 (Showtime Beyond) - Legacy

The effects of Machello's death drive the team nuts.

11:00 PM The Outer Limits (SciFi) - The Sandkings

For summary information, see 7:00 PM listing.