02E04 - Momentum Deferred

When the shipment of cryogenically frozen heads is stolen by a mysterious man, he shots the security guards and one of the guards helps him to kill the guards but is also killed by one of the guards. When Dr. Bishop analyses the corpse, he discovers that the body has blood and mercury; therefore the man is a shapeshifter and Walter concludes that the nurse killed at the hospital was human. The Fringe Division finds an intact device with the shapeshifter and Olivia gives it to Nina Sharp in order to help the Massive Dynamics to find the identity of the shapeshifter that tried to kill her. Meanwhile, Dr. Bishop recalls his former patient Rebecca Kibner (Theresa Russell) that was able to identify shapeshifters with the power developed by the drugs. He brings her to the laboratory to help the investigation. Out of the blue, Olivia faints and recalls her meeting with William Bell in the parallel universe and his warning about the great storm that was coming. She heads to the Massive Dynamics and schedules a meeting with Nina Sharp, but Charlie stops her telling that Nina Sharp is the shapeshifter. When Olivia meets Charlie, she tells the secret disclosed by Bell about the location of the device hidden in a frozen head. Will Olivia learn that Charlie is the chased shapeshifter before it is too late?