Depending which country you live in different sites are licensed to air Prison Break (legally).
First check with the website of the network that airs prison break in your country.
In the US its http://www.fox.com
in Canada its GLOBAL
in the UK it’s SKY 1

Have you looked on fox.com? They have a lot their shows on and have a very good media center to be able to watch it through. That’s where I go to catch up on Prison Break, 24, and House (except they take 8 days to put House on-line).

hulu.com

go onto sidereel.com
it is free no viruses n i av watch every episode from season 1 to season 4 of prison break on it !!!!
xxXxXxXxXxXxXxXxXx ;P <3

Watch Prison Break At http://www.iwatchtv.org