 In order to gain higher level powers, the player must kill the Big Daddy escort and recover the ADAM from the Little Sister.If the title screen of "BioShock" is left to idle, the game's initial launch trailer will play , which graphically shows the violent nature of Big Daddies and Rapture itself - a splicer pulls a Little Sister out of an escape vent, and corners her with a wrench, in order to kill her and harvest her ADAM.A Big Daddy saves her by intervening, which follows a close-quarters melee, in which the splicer has his hand drilled through when he raises it to defend himself - he then injects himself with the Insect Swarm plasmid and attacks the Big Daddy with a swarm of red hornets.