Big Daddies

Lore & Background

Big Daddies roam the underwater dystopian city of Rapture, mentally conditioned through plasmids that strip them of humanity and free will. Their primary directive is to protect Little Sisters, young girls who harvest ADAM from corpses. This relationship was conceived early in development to explore a protector role that appeals to real-world relationships, with Little Sisters referring to their guardians as "Mr. Bubbles" or "Mr. B." Developer Ken Levine described the interactions between players, Big Daddies, and Little Sisters as the cornerstone of the game due to the player's need for ADAM. The suits were designed piece by piece using salvaged city parts, evolving from initial concepts like a wheelchair-mounted version into the iconic Rosie and Bouncer models. A third model, "Slow Pro FUM," was cut late in development but later appeared in BioShock 2 as the Rumbler.

In Their Own Story

In the game's launch trailer, a splicer corners a Little Sister to harvest her ADAM until a Big Daddy intervenes. The ensuing melee sees the splicer's hand drilled through before he injects himself with the Insect Swarm plasmid and attacks with hornets. When the splicer fires a shotgun into the suit's viewport, the Big Daddy is knocked off a balcony but retaliates by ramming its drill through the attacker's back. The scene ends with blood dripping from the drill as the Little Sister cries on the floor; the Big Daddy approaches and holds out an enormous hand for her tiny one to take. In BioShock 2, the player controls Subject Delta, the first successfully pair-bonded Alpha Series Big Daddy. Unlike later generations, if Delta's bonded sister dies or is too far away, he falls into a coma or berserk rage. The Minerva's Den DLC introduces Subject Sigma and the "Lancer" opponent.

Reader's Guide

Big Daddies are armed with rivet guns, heavy drills, rocket launchers, or ion lasers, with Alpha Series equipped with additional weaponry. They do not attack unprovoked but assume an aggressive stance if a player or splicer approaches their Little Sister. If the Big Daddy or the girl is attacked, the guardian retaliates until either it or the attacker dies. A "Hypnotize Big Daddy" plasmid can force them to protect the player, though this abandons the Little Sister and forfeits ADAM collection. Helmet lights indicate mood: yellow for indifference, red for rage, and green for hypnotized friendliness. The Rosie model features a rivet gun and a single oxygen tank on its back, while the Bouncer uses a heavy drill with an engine over the right shoulder.

Did You Know?

• The vocalizations of Big Daddies were performed by voice actor Stephen Stanton.
• A third model named 'Slow Pro FUM' (slow-moving, projectile-shooting, f'ed-up-melee) was cut from BioShock but introduced in BioShock 2 as the Rumbler.
• The helmet lights indicate mood: yellow for indifference, red for rage, and green for hypnotized status.
• In the launch trailer, a Big Daddy kills a splicer by ramming its drill through his back after being shot out of a balcony.
• Alpha Series Big Daddies suffer from a major flaw where they fall into a coma or berserk rage if their pair-bonded Little Sister dies or is too far away.