In order to replace her memories with her alternate counterpart, Olivia undergoes experimental treatment in the parallel universe. She struggles to find a way to transport between universes but she was left imprisoned in “Over There”. She manages to get into a safe house, which turn out to be the home of her mother, who died in the parallel universe. Meanwhile, Walter and Peter get on with their lives, not suspecting that the Olivia with them is her disguised alternate counterpart.
The Fringe Team investigates a mysterious box which causes people to be in a trance like state that ultimately leads to their death. Peter manages to disable the device.
In the parallel universe, Olivia works at a case in which a series of events lead to deadly incidents. The target Milo, plans to kill Olivia in an accident, but was unable to do so because Olivia is from a parallel universe.
Olivia is determined to uncover details about a serial kidnapper “over there”, finds Henry in the process and asked for his help on her mission to return home. The Fringe team finds out about a device that can communicate between universes. Olivia found a way to return to her universe and tells a cleaning lady to warn Peter that she is trapped in a parallel universe before Walternate pulled her back. She ultimately finds herself in grave danger in the parallel universe.
|Episode No||Episode Title||Director By||Air Date|
|Episode 44||"Olivia"||Joe Chappelle||23-Sep-10|
|Episode 45||"The Box"||Jeffrey Hunt||30-Sep-10|
|Episode 46||"The Plateau"||Brad Anderson||7-Oct-10|
|Episode 47||"Do Shapeshifters Dream of Electric Sheep?"||Ken Fink||14-Oct-10|
|Episode 48||"Amber 31422"||David Straiton||4-Nov-10|
|Episode 49||"6955 kHz"||Joe Chappelle||11-Nov-10|
|Episode 50||"The Abducted"||Chuck Russell||18-Nov-10|
|Episode 51||"Entrada"||Brad Anderson||2-Dec-10|
|Episode 52||“Marionette”||Joe Chappelle||9-Dec-10|
|Episode 53||"The Firefly"||Brad Anderson||21-Jan-11|
|Episode 54||"Reciprocity"||Jeannot Szwarc||28-Jan-11|
|Episode 55||"Concentrate and Ask Again"||Dennis Smith||4-Feb-11|
|Episode 56||"Immortality"||Brad Anderson||11-Feb-11|
|Episode 57||"6B"||Thomas Yatsko||18-Feb-11|
|Episode 58||"Subject 13"||Frederick E. O. Toye||25-Feb-11|
|Episode 59||"OS"||Brad Anderson||11-Mar-11|
|Episode 60||"Stowaway"||Charles Beeson||18-Mar-11|
|Episode 61||"Bloodline"||Dennis Smith||25-Mar-11|
|Episode 62||"Lysergic Acid Diethylamide"||Joe Chappelle||15-Apr-11|
|Episode 63||"6:02 AM EST"||Jeannot Szwarc||22-Apr-11|
|Episode 64||"The Last Sam Weiss"||Thomas Yatsko||29-Apr-11|
|Episode 65||"The Day We Died"||Joe Chappelle||6-May-11|