With official DVDs potentially never coming, the fastest way to make Prisoners of Gravity available is streaming video. The quality is far from perfect, but at least it gets the episodes back out in circulation. The videos are from a mix of sources and uploaders.
Season One Episodes
Environment (YouTube) - Part One | Part Two | Part Three
Season Two Episodes
Adaptations (YouTube) - Part One | Part Two | Part Three
Science and Technology (YouTube) - Part One | Part Two | Part Three
Families (YouTube) - Part One | Part Two | Part Three
Robots & Artificial Intelligence (YouTube) - Part One | Part Two | Part Three
Voice/American Artform (YouTube) - Part One | Part Two | Part Three
Humour (YouTube) - Part One | Part Two | Part Three
Marketing & Merchandising (YouTube) - Part One | Part Two | Part Three (without Simpsons clip) | Part Three (with Simpsons clip, on Veoh)
Myths and Archetypes (YouTube) - Part One | Part Two | Part Three
Villains (YouTube) - Part One | Part Two | Part Three
Ecology (YouTube) - Part One | Part Two | Part Three
Season Three Episodes
War (YouTube) - Part One | Part Two | Part Three
Dreams (YouTube) - Part One | Part Two | Part Three
Children (YouTube) - Part One | Part Two | Part Three
Watchmen (YouTube) - Part One | Part Two | Part Three
Metamorphosis (Google Video) - Link
Season Four Episodes
Fans (YouTube) - Part One | Part Two | Part Three
Time Travel (YouTube) - Part One | Part Two | Part Three
Shared Worlds (YouTube) - Part One | Part Two | Part Three
Medea/Murasaki (YouTube) - Part One | Part Two | Part Three
Jack Kirby (YouTube) - Part One | Part Two | Part Three
Season Five Episodes
The Sandman (Google Video) - Link
Tolkien (YouTube) - Part One | Part Two | Part Three
Amnesia/Total Recall (YouTube) - Part One | Part Two | Part Three
Random Clips
Season One Opening, Version One - Link
TVOntario Fundrasing Footage, season two - Link
Knowledge Network/GEnie Ad - Link
Alan Moore Steve Bissette Interview from the episode Metamorphosis - Link
Douglas Adams Interview from the episode Robots & Artificial Intelligence - Link