Captain Nemo has built a fantastic submarine for his mission of revenge. He has traveled over 20,000 leagues in search of Charles Denver - a man who caused the death of Princess Daaker. Seeing what he had done, Denver took the daughter to his yacht and sailed away.

When Dr. Carson marries Daphne Standing among the guests is her former suitor, Laurelton. The couple are happy but as Laurelton's jealousy grows, he gets drunk and decides to have his way with Daphne. He leaves an urgent phone message for Carson to hurry to his office because of an accident. Watching him depart Laurelton tries to enter the apartment but Daphne takes refuge in a locked room calling Carson who rushes home and finds Laurelton trying to break into his wife's room. They fight until the police intervene but when Carson opens her door Daphne, believing he is Laurelton, shoots him. His injury is minor, and the officers take Laurelton in charge.

First National gala celebrity banquet with stars.

A professor seeks to prove life after death by reviving a dead body.

Don Fernando, smitten with Giulia, a Spanish dancer, persuades the young and innocent girl to run away with him. Valeska, the sister, finds a note on the table the following morning, telling her that Giulia has gone, never to return. Months later, however, Giulia returns to her home, having been deserted by her unfaithful lover. Giulia enters the convent. The sister meets Don Fernando some time later. He tries to influence the girl to marry him. Don Fernando's life is saved by Sister Valencia, who interferes just as Valeska is about to stab the villain. Valeska is later thrown into a dungeon by Fernando, who declares he will '"have her." The pretty Spanish girl does not stay in her prison long. Sister Valencia, discovering Valeska's whereabouts, gets her out of her prison in a clever way. Valeska then enters the convent, where her sister is overjoyed at the happy meeting, and ending.

The enemy's success in smuggling a spy through the lines places the Stratiria armies in a dangerous position. The spy is intercepted and killed by Pettrus Baariot, the telegraph operator, who then succeeds in sending a message that saves the Stratiria forces from defeat. For his heroism, Pettrus is promised a promotion, but after his recovery from his severe wounds, he is humiliated through the treachery of Danick Rysson, a government official who desires to marry Floria Natarre, Pettrus' beloved. Bitter, Pettrus listens to the overtures of one of the enemy and steals the new telegraph code.

Although she is secretly in love with Wade Clayton, Laura Sheldon accedes to the wishes of her parents and marrries George Baring. Soon after, war breaks out between the North and South, and Clayton is made captain of the regiment. The entreaties of Laura prompt Baring to enlist against his will. Seized with fear during battle, Baring attempts to run away but is shot by a comrade and left for dead. At the finish of the war, Clayton returns home and relates how bravely Baring died in action. A few years later, Baring, who had been hiding in Cuba, returns.

Hartley, fascinated by the vampish Leonie, steals and serves a term in prison. Not satisfied with this downfall, Leonie again works her womanly charms upon Dr. Gerald, who is engaged to Johanna, the adopted daughter of Dr. McLean. Learning of the woman's designs on the young doctor, Hartley denounces her in Gerald's presence. In response, Gerald foolishly renounces Johanna and his friendship with Dr. McLean. However, when Leonie discovers that Johanna is her own daughter whom she had deserted as a child, she becomes conscience-stricken, gives up the young man and begs forgiveness.

Jules, the son of French General Bleriot, agrees to give a masked blackmailer his father's secret military papers when threatened with exposure of his gambling debts. Masked, Jules steals the papers, but during a struggle with his father, Jules receives a knife wound in his arm.

Inventor George Grant and his partner, financier John Benson, accept an offer of $200,000 for the rights to an invention. After Grant breaks up a fight in a bar between drunken Dave Wilson and an old man reprimanding him, Dave is told by his mother to apologize to Grant. He meets Benson, who witnessed the fight, outside Grant's apartment and tells him his purpose, but during Dave's conversation with Grant, Grant suddenly drops dead. The police find Dave hiding, and after a pistol is found outside and Benson tells them about the fight but says he knew nothing about Dave's apology, Dave is convicted of murder and electrocuted.