William Sadler reprises his guest role as Dr. Bruce Sumner, Walter's doctor, and tries to assess Walter's mental condition.
Milkshakes and Tinfoil Hats
When two bullies chase a boy into a tunnel and try to beat him up, the bullies are attacked by a rapidly growing fungus. Olivia and Lincoln track down the third boy, Aaron, who wasn't hurt by the fungus and bring him to Walter's lab for examination. While there Walter bonds with Aaron and expresses that he knows what it's like to be lonely.
Over milkshakes, Walter tells Aaron about his son, Peter, who died of an illness in this universe and when Walter went to get Peter from the other universe he fell into the frozen lake and drowned. Read More...