An American Werewolf in London

David becomes a werewolf after being attacked by one on the Yorkshire moors. The curse is transmitted through the werewolf's bite, which infects David with the lycanthropy virus. Once infected, the transformation becomes permanent and triggers automatically during every full moon. There's no cure shown in the film, the curse is irreversible.

The locals warn them about the full moon before the attack, establishing that the werewolf cycle is tied to lunar phases.

Jack appears as a ghost because he was killed by the werewolf and is trapped in a kind of purgatory. His spectral form becomes increasingly decomposed with each appearance, revealing that time moves differently in death. He urges David to kill himself because Jack knows the werewolf curse will force David to kill innocent people, and Jack wants to spare his friend from becoming a murderous monster that will also end up in hell-like surroundings.

The five-pointed star is a protective symbol used to ward off werewolves. When Jack asks about it, the locals become hostile because discussing werewolf defenses was considered dangerous or taboo in this village. The star represents the community's attempt to protect themselves from the creatures that roam the moors.

The star appears prominently before the attack, establishing the werewolf threat exists in this location.

When Jack's ghost first urges David to end his life, David is in denial about the werewolf reality. He's just woken from a three-week coma, struggles to remember the attack, and refuses to accept that he's now a monster. Additionally, David has developed a relationship with nurse Alex, giving him hope that he might find another way to stop the transformations. His hope for a cure and fear of death keep him from taking immediate action.

Jack's ghost appears progressively more decomposed, showing time is running out.

David receives a mysterious phone call directing him to an adult movie theater, where Jack's ghost appears alongside other vengeful spirits of the werewolf's victims. They show David a disturbing slideshow of suicide methods, pleading with him to kill himself so they can all be freed from their undead torment. This scene represents David's complete loss of hope and his connection to the supernatural world of the cursed dead.

Jack's earlier warnings about the rampage foreshadow the growing number of angry spirits.

David attempts to turn himself in at Trafalgar Square because he's desperate to stop the killing. After his first transformation resulted in six deaths, he wants authorities to contain him before the next full moon. However, he's unable to go through with it, he can't bring himself to accept death, and he's also afraid of what will happen if people see him transform. This moment shows his internal conflict between his human conscience and his monstrous nature.

Jack's warnings about the coming rampage create tension leading to this attempted surrender.

David transforms into a werewolf specifically during the full moon. The first transformation occurs weeks after the initial attack, triggered by the lunar cycle. Each subsequent transformation happens automatically when the full moon rises, regardless of David's location or mental state. The transformation is involuntary and beyond his control, once the full moon appears, the change begins whether he wants it to or not.

The locals' warning 'beware the full moon' directly establishes the lunar trigger before the attack occurs.

The police shoot David because they've been hunting a werewolf that's killed multiple people throughout London. When they corner him in the alley, David lunges toward Alex while in his feral state. The police perceive him as an immediate threat to Alex's life and fire, killing him. While tragic, this ending represents David's worst fear becoming reality, he became the monster Jack warned him about, and he dies in his werewolf form rather than as a human.

Jack repeatedly warns that David will hurt others, and the earlier rampage scene establishes the police's lethal response to the creature.

When David is attacked and losing consciousness, he sees the naked man, which is actually the werewolf in its human form before transformation. The werewolf is depicted as a normal man in daylight but transforms into the beast at night, particularly during the full moon. This glimpse represents the duality of the creature: a human who becomes a monster, which mirrors David's own fate of becoming the very thing that attacked him.

This vision hints that the werewolf was once human and that David will share this same tragic transformation.

Alex cannot save David because the werewolf curse is a supernatural condition that modern medicine and human love cannot cure. Despite her care and deepening relationship with David, she's powerless to stop the transformations. Her voice does briefly reach David during the final confrontation, creating a moment of humanity in the beast, but it's not enough to overcome the curse. The film portrays the curse as an irreversible fate that ultimately leads to tragedy.

The local's warning 'He'll harm others when he changes' establishes early that no one can prevent the curse's consequences.

Jack exists in a kind of purgatory after death, not in heaven, but trapped between worlds. He's tormented by his violent death and the circumstances that led to it. His appearance deteriorates with each visit to David, showing that his spiritual state is decaying. He's desperate for both his own release and David's, which is why he pushes so hard for David to commit suicide before the curse causes more deaths.

David kills six people during his first full moon transformation. The rampage occurs across London as he hunts in his werewolf form. After awakening confused in a London Zoo enclosure with no memory of the night, David learns of the deaths through news reports and Jack's ghostly confirmation. This death toll establishes the stakes and explains why the police pursue him so aggressively.

Jack warns David about the impending rampage before the full moon arrives.