"Big Daddy" is a term that can refer to various figures in popular culture, but it is most commonly associated with the character from the play "Cat on a Hot Tin Roof" by Tennessee Williams. In the play, Big Daddy is a wealthy plantation owner who is facing terminal illness and grappling with family dynamics and secrets. Additionally, "Big Daddy" can refer to a character in the video game series BioShock. In this context, Big Daddies are large, heavily armored beings that protect Little Sisters, who are young girls that collect a valuable substance called ADAM. The Big Daddies are known for their imposing presence and unique design.