Psi Cop Bester informs Sheridan of a Shadow cargo ship carrying weapons so unusual that the telepath is compelled to join the new alliance.

Sheridan unveils the Babylon Treaty, which asks participants to help defend the space station; a troubled man claims to be King Arthur.

Vir forges identity papers for Narn refugees, including one who assaults him and his prearranged bride-to-be.

Garibaldi confronts Lochley; Minbari Rangers enlighten Delenn about their training techniques.

Two ordinary crewmen go about their normal routine while the station defends against an alien attack.

G'Kar drafts the Declaration of Principles; role of refugee telepaths.

Nightwatch conspires to destroy Sheridan; Londo tells Lord Refa to end his alliance with Mr. Morden; a rebirth ceremony is held after Delenn is wounded protecting Sheridan.

President Clark sends elite forces to seize Babylon 5 and orders Mars bombed when the colony refuses to enact martial law.

The Earth Alliance declares martial law on Babylon 5, causing riots that nearly injure Londo's guest, Lady Morella, and pitting Sheridan against Nightwatch.

To recover from a heart attack, Londo must face his fears and heal his soul.

Ivanova's replacement arrives during Sheridan's inaugural preparations; a renegade telepath foils an assassination.

A future archivist reviews Earth's history beginning with the formation of the Alliance and Sheridan and Delenn's legacy before sending the records to the new Earth.

An archaeologist knows of Earth's plans for newly discovered Shadow ships; President Clark declares martial law.

Shadow vessels gather on the edge of Centauri space, Lurkers are chosen to merge with a race via parasite, and Marcus reveals his attraction for Ivanova.

A Psi-cop (Walter Koenig) comes after a dealer in dust, a mind-enhancing drug that could be a powerful weapon.

Acting President Luchenko (guest star Beata Pozniak) offers Sheridan (Bruce Boxleitner) amnesty in return for his resignation from Earthforce; Mars becomes independent; the League of Non-Aligned Worlds proposes a new Alliance. Guest star: Walter Koenig.

Sheridan leads the Resistance in a last battle to free Earth and Mars; Lyta engages the telepaths for help; President Clark aims the defense grid at Earth.

Lyta, Franklin and Garibaldi help Sheridan escape; Ivanova attacks Earth destroyers; Sheridan returns to Babylon 5.

Ivanova contacts the First Ones, ancient enemies of the Shadows; Sheridan gets a new political officer.

Brother Edward, a new arrival on the station, is haunted by visions and learns he was subjected to a punishment called death of personality.

G'Kar is ordered back to Narn; Franklin behaves strangely; an alien pod demands answers to an IQ test.

A spinoff of "Star Trek: The Next Generation," "Deep Space Nine" is set on a space station near the planet Bajor. This time, Commander Benjamin Sisko is in charge of a diverse crew. But unlike other "Star Trek" series, there's no USS Enterprise to help them. Sisko and the crew must fight off rival alien species who want control of Deep Space Nine because of its strategic position close to a wormhole, which allows speedy travel to the far reaches of space.

The iconic series "Star Trek" follows the crew of the starship USS Enterprise as it completes its missions in space in the 23rd century. Captain James T. Kirk -- along with half- human/half-Vulcan science officer Spock, ship Dr. "Bones" McCoy, Ensign Pavel Chekov, communications officer Lt. Nyota Uhura, helmsman Lt. Hikaru Sulu and chief engineer Lt. Cmdr. Montgomery "Scotty" Scott -- confront strange alien races, friendly and hostile alike, as they explore unknown worlds.

This update of the late-1970s series takes a decidedly darker tone as what's left of humankind struggles for survival against the robot Cylons, who have killed millions. The Galactica, led by William Adama, protects a patched-together fleet of civilians -- led by de facto president Laura Roslin -- in search of a mythical planet called Earth.

Kathryn Janeway is the captain of a starship that is lost in space and must travel across an unexplored region of the galaxy to find its way back home. On its way, the crew encounters different species they must deal with, but find that all their adventures only make them long for home.

Featuring a bigger and better USS Enterprise, this series is set 78 years after the original series -- in the 24th century. Instead of Capt. James Kirk, a less volatile and more mature Capt. Jean-Luc Picard heads the crew of various humans and alien creatures in their adventures in space -- the final frontier.

An eccentric yet compassionate extraterrestrial Time Lord zips through time and space to solve problems and battle injustice across the universe, traveling via the TARDIS (Time and Relative Dimensions in Space), which is his old and occasionally unreliable spaceship that resembles a blue police phone box (but changes its appearance depending on its surroundings) and is much, much larger inside than outside.

A team of explorers made up of soldiers and scientists travels through a Stargate, an ancient portal to other planets. They use the Stargate to explore new worlds, forge ties with friendly civilizations and protect Earth from hostile forces. The TV series is based on the theatrical film "Stargate."