"Mr. Green Jeans" is a character from the children's television show Captain Kangaroo, which aired from 1955 to 1984. Portrayed by Bob Keeshan, the character was known for his green overalls and love of nature. He often interacted with animals and taught children about the environment. The character was a friendly figure who engaged in various activities, such as storytelling and crafts. Mr. Green Jeans helped promote educational content in a fun and entertaining way, making him a beloved part of many children's childhoods during the show's long run.