The Secret of Lost Valley(1980)

The Secret of Lost Valley is an adventure film about a boy named Adam who becomes separated from his family during an outing in the forest. There he encounters another boy living wild in the woods, and the two form an unlikely friendship despite their vastly different backgrounds, communicating through sign language. When scientists discover the wild boy and capture him for study, Adam must act quickly to help his new friend escape. The film explores themes of connection, loyalty, and the clash between civilization and nature, following Adam as he risks everything to protect someone he's come to care for deeply.