The Internet Archive operates in a complex legal space regarding copyrighted material. While the site hosts millions of items, users should be aware that uploads of copyrighted television series may be subject to "DMCA takedown" notices by rights holders (like 20th Television). If a link is active today, it might not be tomorrow. The Legacy of Futurama
Occasionally, users upload entire seasons of the show. These are often sourced from original DVD releases or TV broadcasts.
Having access to the ensures that whether you are a "Newbie" or a seasoned fan who can speak fluent Alienese, you can always hop in the ship and head toward the future.