What drew Morgan Freeman to "Dolphin Tale," the true story of a critically injured dolphin and the commitment of a boy to save her life? "Instant chemistry."

"It's hard, I think to pass up a story that involves a child and a wounded animal," Freeman says in one of multiple extras on the "Dolphin Tale" DVD and Blu-ray, on sale today. "There's almost an instant chemistry between the two."

Check out never-before-seen footage of Freeman and Winter, the dolphin who underwent the harrowing ordeal in real life, in this exclusive clip: