|Occupation:||Mad scientist, FBI consultant|
|Relationships:||Peter Bishop (son), William Bell (former coworker)|
|Other:||Played by actor John Noble|
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He was institutionalized after a lab accident resulted in the death of his assistant. Walter spent 17 years at Saint Claire's, and was recently released into the custody of his son. While still brilliant, Walter's behaviour is erratic. Many of the strange events the Fringe division investigates have a link with Walter and William Bell's research.
He is frequently assisted in his research by junior FBI agent Astrid Farnsworth, whose first name he has perpetual trouble remembering correctly.
Season two introduced Walternate, Walter's double from a parallel universe.
Fan Reactions & Meta
In fanfiction, Walter is sometimes paired with Astrid. Astrid & Walter friendship fics are also common.