An hour before his execution, Baron
Victor Frankenstein calls for a priest. Refusing spiritual
comfort, he begs the priest to listen to his story: As a wealthy,
young orphan, dissatisfied with the local schoolteacher and eager
for knowledge, Victor advertises for a tutor and hires Paul Krempe,
who becomes his mentor and later his partner in scientific inquiry.
In the laboratory above Victor’s mansion, they discover the key to
life and are able to revive a dead puppy. Although Paul wants
to share their discovery with fellow scientists, Victor wants to
continue their work using humans.
After bringing the dead back to life, he
now wants to create life and convinces the reluctant Paul to help
him retrieve the corpse of a recently hanged man to use as the basis
for a new human. When Victor gathers high-quality body parts
from the charnel house, Paul becomes increasingly uneasy, finally
reaching the point of refusing to assist.
While Victor travels to another city to
obtain the hands of a recently-deceased, famous sculptor, his cousin
Elizabeth arrives, after the death of her mother. Having loved
Victor since childhood, she is eager to marry him, in fulfillment of
an arrangement their mothers made. Although Paul hopes that
her presence will persuade Victor to discontinue his grisly
experiments, Victor, who is having an affair with the maid, Justine,
behaves courteously, but remains unchanged.
After mentioning that he needs the
brains of a genius for his creation, Victor invites the elderly
Professor Bernstein for an extended visit. The professor is
grateful for the hospitality and for what he thinks is Victor's
interest in his work. In a conversation with Paul, Elizabeth
and Victor, the professor suggests that having knowledge is
different from knowing what to do with it and explains convincingly
the scientist’s dilemma of handing over discoveries to people who
mishandle the information. At the end of the evening, while
leading the professor to his bedchamber, Victor maneuvers him into
falling over the balcony’s banister to his death. Appearing to
act out of generosity, Victor buries Bernstein, who has no living
relatives, in his family vault, but later robs his grave.
Knowing that Victor is using the professor’s brain for his
experiment, Paul accuses him of murder and mutilation.
When their resulting fight results in
the lab being damaged, Victor orders Paul to leave. Before
going, Paul enters Elizabeth’s bedchamber to beg her to leave with
him, claiming he has stayed only to protect her. He tells her
that Victor, although neither wicked nor insane, is so wrapped up in
his experiments that he cannot see the consequences and warns her
that she is in physical and mental danger. However, Elizabeth
is in love with Victor and wishes to help with his work, even though
she knows nothing about it.
Later, when Victor is ready to use an
electrical charge to bring his monster to life, he asks for Paul’s
help. Paul at first refuses, until Victor threatens to train
Elizabeth for the job. Fearing that Elizabeth would be
traumatized to learn the truth about Victor's work, Paul unhappily
agrees to help. Victor and Paul then harness electricity
during a storm to bring the creature to life. Its first act is
to try to strangle Victor, but Paul stops him and the creature is
then strapped down. To no avail, Paul urges Victor to destroy
the monster, but Victor refuses. The creature then escapes and
kills an old blind man who is hiking in the mountains with his young
grandson. Without alerting the police, Paul and Victor track
down the monster, and Paul shoots it in the head, against Victor’s
wishes. They bury the creature, but Victor later unearths it
and resumes his experiments, soon returning it to life. Upon
learning of Victor’s plans to marry Elizabeth, Justine tells him
that she is pregnant. When he refuses to marry her, she
threatens to inform the authorities about his sinister work.
During the night, she sneaks into the laboratory, and after Victor
locks her inside, she is killed by the creature.
On their wedding night, Victor leaves
Elizabeth to work in his laboratory. Paul, who missed the
wedding ceremony, arrives that night and learns that the monster,
which is now a brain-damaged, cowering creature, has been revived.
Blaming Paul’s bullet for the change in the creature’s demeanor,
Victor says he plans to find a new brain for him. Paul leaves
to alert the authorities, and Victor follows, hoping to dissuade
him. From the mansion's ground they see that the creature has
broken his chains and wandered out onto a roof carrying Elizabeth,
whom he captured after her curiosity led her into the laboratory.
Victor shoots at the monster, but wounds Elizabeth instead, and the
monster moves toward him. In the ensuing struggle, Victor
attacks him with a lantern, causing the monster to catch fire and
fall through the roof skylight into an acid bath.
In his jail cell, Victor tells the
disbelieving priest that his “life’s work” was destroyed.
Paul, the only person who can confirm Victor’s story, arrives, but
refuses to corrorborate his account. The priest, warden and
Paul then leave Victor's cell. Outside, Paul, who has always
cared for Elizabeth, tells her that “there is nothing we can do for
him now” and takes her home. Later, Victor, who is sentenced
to die for the murder of Justine, Bernstein and the old man, is
taken to the guillotine.