The demon is first seen in the movie Annabelle. After a Satanic cult invades the home of John Form and his then-pregnant wife Mia, the Annabelle doll that John gave Mia as a gift becomes a conduit for the demon. Since then, the demon spent time tormenting Mia and her daughter Leah. Toward the end of the film, the demon kidnapped Leah and offered to give Leah back in exchange for Mia's soul. Mia attempts to give the demon her soul, but John arrives in the nick of time and stops Mia. Mia insists on giving her soul to the demon until Evelyn steps in to take Mia's place. Evelyn commits suicide to give the demon her soul and then Leah is returned. Since then, the Forms have gone back to their normal lives.
The demon appears to be absent of any kind of mercy or remorse, often toying with its victims before attempting to kill them and take their souls.