Michael seeks revenge against Whistler and Gretchen and uncovers unbelievable news; Lincoln and Michael are reunited with the gang and get an offer from a Homeland Security agent; Mahone experiences a devastating loss; T-Bag is deserted.
The team uses "brain-printing" when a suspected serial killer awakes from a four-year coma but doesn't remember any of the crimes.
Cuddy receives news that forces her to re-evaluate her priorities; a teenage patient's suspicious body scars suggest his illness is more than physical.
A known addict may have abducted an elderly man; a freeway shooting; Chickie's new partner shoots a 13-year-old boy.
Kate's friend, a known drinker, sees ALF in the kitchen and thinks she's hallucinating.