Peter Flemming

The thrilling worlds of Fringe near the end in the first part of a two-hour series finale as Olivia embarks on a dangerous and otherworldly journey into the unknown.

Lana has a stalker which leads her to an unexpected hideout. Also, Chloe has to reevaluate her feelings for Clark after she and Jimmy break up due to Jimmy's belief that she isn't really over Clark.

After working for countless hours on the Replicator coding Dr. McKay (David Hewlett) reluctantly admits that he needs help with the program. And the only available person who can match - or exceed - his knowledge is his sister Jeanie (Kate Hewlett). After working on the calculations from Earth Jeanie sends her results back to Atlantis and heads to bed. But the calm is broken when her bedroom is stormed by four men wielding MP-5's who tie up her husband and drag Jeanie into the night. When news reaches Atlantis that his sister is missing McKay travels to Earth racked by guilt for involving his sister. He is determined to find her and uncover who is behind the kidnapping. But when McKay also goes missing it's up to Lt. Col. Sheppard (Joe Flanigan) and Ronon (Jason Momoa) to figure out who has stolen the Replicator information... and the only two people who have the knowledge to understand it.

As SG-1 continues to piece together clues to the whereabouts of the elusive Ancient weapon that could defeat the Ori an alien vessel streaks into Earth's atmosphere towards the SGC. When the vessel does not respond to hails it is shot down and crash lands. To everyone's surprise the pilot is none other than Ba'al (Cliff Simon). Ba'al informs SG-1 that his clones which he had created to assist him are now turning against him and he is seeking SG-1's help in tracking them down and obliterating them. In exchange he promises to assist SG-1 by giving them the key to finding the planet on which the Ancient weapon is located. Realizing that Ba'al's clones might turn over the location of the weapon to the Ori the team sets to work capturing the clones and bringing them back to the SGC. Soon there are nearly 20 Ba'al clones in isolation at the SGC all claiming to be the real Ba'al. Before the team members are able to elicit any useful information from the clones they escape - turning Stargate Command into a battlefield.

The link between a gruesome murder and the decapitation of two nurses more than twenty years earlier lead the squad to a set of secret-keeping brothers.