This page is absolutely filled with spoilers!It is NOT for new viewers unless you don't mind getting spoiled. Once you've finished watching season 5 you can browse this page without seeing spoilers.
Below are all versions of Walter Bishop played by John Noble throughout the series.
Walter Bishop
The original version of Walter introduced in the pilot.
Walter in the future in 2036 after he starts to gradually become the man he used to be after having his brain repaired with brain fragments from his younger self.