Several hundred years in the future, the resources of the Earth runs out, and the progression of the human race has stagnated. The world is now divided into "Units". A boy named Hajiki Sanada lives with his mother and sister in Unit 74, in a place called "Night Town", in which all electricity is shut down at midnight. The key in this story is an object called the GAD. GADs have the ability to reconstruct materials while reacting to feelings of an organic life. The size and shape of the resulting product seem to be different depending on the kinds of feelings that the life possesses. When Hajiki comes in contact with one by accident, it transforms into a huge robot--a Tekkoudo, or "Iron Giant"--which Hajiki names Lightning. And soon he realizes that he isn't the only one with a Tekkoudo, and must find out how to deal with those others who he feels are the "same" as himself.
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(Source: Anime News Network)

Episode 1 - Looking Up At the Same Sky

Episode 2 - Putting the Pieces Together

Episode 3 - On a Street Corner in Night Town

Episode 4 - With Bright Eyes

Episode 5 - And Then the Rain Will Fall

Episode 6 - Five Masks

Episode 7 - If I Can Fly

Episode 8 - Two Lost Souls

Episode 9 - Snow Melts the Heart

Episode 10 - Bundles of Bills in the Setting Sun

Episode 11 - No Returning to Rainbow Town

Episode 12 - Bluebird

Episode 13 - Dwellers of the Dark

Episode 14 - Seeking Lost Time

Episode 15 - A Garden in the Sun

Episode 16 - The Day We Bare Our Fangs

Episode 17 - Guns - Swords - Beasts

Episode 18 - The Logic of Those Who Leave

Episode 19 - A Road Companion

Episode 20 - The End of the World

Episode 21 - Blue Slumber

Episode 22 - Spiral Dance of Glass

Episode 23 - The Atoning Man

Episode 24 - The Will to Aspire to the Heavens

Episode 25 - Time For the Sky

Episode 26 - Young Traveler

GONZO

Funimation

Media Factory

Imagica

Amber Film Works

Hakuhodo DY Music & Pictures

Fuji TV

Gad Guard