When Crichton rejoins Zhaan and Chiana, he sends Zhaan to keep Pilot company, talks Chiana out of fleeing -- it helps that Pilot can't open the outer doors anyway -- sends her to find Rygel in Tier 8, and goes to find Aeryn in Maintenance Bay 3

The maintenance bay is deserted. As he searches for Aeryn, Crichton is disturbed by a rattling of tools, an odd noise and a sense he's being watched.

Then he stumbles through another fissure, landing in a disorienting, red-lit version of Moya. D'Argo is there too, and briefly spots him, but collapses before he can draw Crichton's attention.

Stumbling and retching, Crichton makes his way to Pilot's den -- Pilot is missing -- and then back up to the command center, where he hears the strange noise he heard in the maintenance bay. Following it to the ceiling, he's pulled into a second fissure, and collapses in a blue-lit version of Moya.

The blue Moya is almost worse than the red version. Deafening noises leave Crichton almost unable to hear his own thoughts.

Pilot is still missing from his den, but a few minutes later Crichton finds Aeryn. Startled, she promptly pulls a gun on him.

They can't hear each other talk, but manage to establish through gestures that neither of them has seen D'Argo or Rygel.

Crichton takes Aeryn to the command center to show her the fissure, but it seems to have vanished. Continuing their search for the others, they briefly encounter glowing claw marks in the air.

Crichton spots his voice recorder, and reaching for it, is sucked into a third fissure.

The new fissure deposits Crichton in a quiet, yellow-lit version of Moya, where he quickly finds Rygel, who's in disturbingly good humor. His mood is infections, and Crichton quickly realizes it's an effect of the yellow zone.

Doing his best to remain serious, he searches for and finds one more fissure, which deposits him back in the normal version of Moya.

Returning to the command center, he brings Zhaan, Chiana and Pilot up to date. Pilot has a theory: due to the inadequate thrust from jumping too soon, Moya is still stuck in starburst, and is slowly drifting apart along the directional axes beyond the three dimensions we know.

To make things worse, the howling noises and claw marks they've been seeing suggests that something nasty is in extra-dimensional space with them, trying to get into the ship.

There may be a way out. If Moya can reverse thrust in all four versions of herself at once, she might be able to pull herself back into normal space.

As Crichton prepares to tell the others what to do (having learned the engine reverse sequence from Pilot), the clawed entity comes through the ship again, whirling through the air and stopping right in front of Crichton.

The plan is quickly changed. Zhaan stays to defend the ship from the alien invader, while Chiana and Crichton pass through the fissure to the red zone, which they quickly learn doesn’t affect her.

They soon find D'Argo, who's has rigged a mask to shield his eyes from the disorienting light. He's only throwing up occasionally now.

To D'Argo's dismay, Crichton doesn’t have a mask.

With the creature about, Chiana won't stay behind alone, so Crichton teaches D'Argo the sequence and heads for the blue zone -- which drops Chiana like a rock. She's as vulnerable to the blue zone as she was unbothered by the red zone, and Crichton frantically carries her through the ship and to the next fissure.

Crichton continues his search for Aeryn, only to encounter the creature again. This time it leaves marks in the bulkhead, but Crichton doesn't shoot.

There's something about the marks . . .

Aeryn finds them and drives the creature away. She's rigged flight headsets to block the noise and allow communication.

She also knows the engine reverse sequence already, thanks to having been infected with Pilot's DNA in "DNA Mad Scientist". After a quick trip to the yellow zone -- where Chiana and Rygel are thoroughly enjoying themselves -- Crichton returns to the normal Moya.

They return to the command center, reverse thrust . . . and it doesn't work. Moya's still stuck, and Pilot thinks their only hope of escape might be jettisoning the baby.

Crichton's won’t let him do that. Meanwhile, the creature appears again, clawing slashes into the bulkheads.

Crichton suddenly sees a pattern in the slashes: the groups for a sequence of prime numbers. The creature is trying to communicate.

"This isn't an attack," he tells Zhaan, "it's an invitation."

A glowing hole opens at the forward bulkhead. Convinced he can talk to the creature, Crichton enters and finds himself in a placeless space.

He can barely perceive the being he's encountered, but they can talk. It's a guardian, charged with repairing breaches in this extra-dimensional space.

The stranded Moya is tearing a hole in this part of space, and if she can't be freed, the guardian will have to destroy her. They can’t simply go backwards, either -- it'll tear the hole irreparably – so their only chance is to go forward and hope the guardian can guide them back to normal space.

Returning to Moya, Crichton races through the different zones of the ship with new instructions: forward thrust, all at once. Time's running out for them all; whole sections of the ship are vanishing around them.

Crichton makes it to the yellow zone just in time to activate the engines, and with a tremendous rumbling and shaking the ship breaks free. The ship snaps back into it's proper configuration, and everyone winds up sprawled over each other, laughing uncontrollably around a very puzzled Pilot.

The interrupted dinner is resumed, but the euphoria of surviving carries over. D'Argo and Rygel tell wild stories, while Zhaan points out to Chiana that she's kicked more butt than Chiana's sat on.

Pilot's still puzzled by their behavior -- why's everybody so happy after such a close brush with death?

He's got good news, though: the baby's okay, in fact better than okay. Moya is confident it will be born soon.

Crichton raises a toast. "Today is a good day, people," he tells the others. "To a healthy, happy baby . . . "