The crew takes the offensive in the coming conflict, rescuing a Ranger training camp from a Shadow attack. A representative from Earth questions the ambassadors about the Shadows, and Londo severs ties with Mr. Morden.
An alien probe threatens the station with destruction, as G'Kar's status among the local Narn is challenged by a Centauri-appointed representative. Vir is reassigned to the Minbari homeworld.
A member of Brother Theo's monastic order discovers his dark past, and becomes the target of a family seeking revenge. Telepath Lyta Alexander returns to B5 serve the Vorlon ambassador.
With help from Draal and the Great Machine, Ivanova and Marcus go looking for the First Ones to aid in the coming war. Earth assigns a political officer to "advise" Captain Sheridan.
Marcus and Franklin investigate a race of alien parasites that begin to claim the lives of lurkers living in Down Below. Ivanova is ordered to confirm where Lieutenant Corwin's loyalties lie.
Sheridan and Delenn take the Whitestar to Jupiter in a desperate attempt to destroy a Shadow vessel that has been discovered buried beneath the surface.
As a civil war begins to erupt back home, Earth orders the Nightwatch to take control of Babylon 5 security -- pitting Sheridan and Garibaldi against them. Zack is forced to make a decision about his loyalties.
Captain Sheridan and his crew are forced to make a fateful decision about their allegiance when Earthforce ships assault the station to enforce President Clark's declaration of marshal law.
Ambassador Delenn is held hostage by Nightwatch members who stayed behind when the station's crew declared independence from Earth. Mollari offers Lord Refa an ultimatum.
Vir entertains a woman who is to be his wife, but soon finds himself the target of Narn attackers. Ivanova discovers a terrible secret about Vir's actions on the Minbari homeworld.
A mysterious stranger shows up on B5, claiming to be the legendary King Arthur. Sheridan and Ivanova work with alien governments to obtain formal recognition of the station's independence.
Psi-Cop Alfred Bester leads the crew to a shipment of weapons components being delivered to the Shadows. G'Kar is brought in on the conspiracy of light, but only after Delenn makes a heart-rending confession.
Sheridan pressures Kosh to bring the Vorlons in on the offensive against the Shadows -- but at a terrible price. A betrayed Londo rekindles his association with Mr. Morden, and Franklin confronts his problem.
Jeffrey Sinclair returns with a plan to rescue Babylon 4 in the past -- then hijack it to be used as a base of operations in the last Shadow War, 1,000 years ago.
Dr. Franklin begins a journey to find himself, and meets a down-and-out singer in Down Below. Sheridan enlists Lyta's help to test a new weapon against the Shadows, and the new Vorlon ambassador arrives.
Garibaldi finds an entire level isolated from the rest of the station, which harbors a dangerous secret. Delenn prepares to be made head of the Rangers, but receives a threat on her life.
Londo orchestrates the capture of G'Kar by convincing him that an old friend has been found on Narn. Captain Sheridan is consumed with his analysis of the Shadow's attack patterns -- or lack thereof.
Sheridan and Delenn launch a preemptive strike against the Shadow's forces. As their relationship progresses, a face from the past makes a sudden arrival. Meanwhile, Franklin finds himself near death after an assault.
Sheridan's wife -- believed to have died years ago on the Shadow homeworld -- arrives on Babylon 5. John agrees to go to Z'Ha'Dum with her and meet his enemy face-to-face, and a fleet of Shadow ships surround the station.
