When an experimental space voyage goes awry, four people are forever changed by cosmic rays: Reed Richards, inventor and leader of the group gains the ability to stretch his body and takes the name Mr. Fantastic. His girlfriend, Sue Storm, gains the ability to turn invisible and create force fields becoming The Invisible Girl. Her little brother, Johnny Storm, becomes The Human Torch with the ability to control fire, including covering his own body with flame. The pilot Ben Grimm is turned into the super-strong, super-tough Thing. Together they become a team of super-heroes and use their unique powers to foil the evil plans of villains.
Reed Richards (Alex Hyde-White) and Victor Von Doom (Joseph Culp) are college friends who use the opportunity of a passing comet to try an experiment; however, the experiment goes wrong, leaving Victor horribly scarred. Sue and Johnny Storm (Phillip Van Dyke) are two children living with their mother (Annie Gagen), who has a boarding house where Reed lives. Ben Grimm is a family friend and a college buddy of Reed's.
Ten years later, Reed, Sue (Rebecca Staab), Johnny (Jay Underwood), and Ben go up into an experimental spacecraft as the same comet passes by Earth. They are hit by cosmic rays from it, due to a necessary diamond being exchanged for an imitation of itself by the Jeweler. Reed dedicates this mission for his friend Victor, believing he was dead years before.
Upon crash-landing on Earth, the four discover that the cosmic rays gave them special powers: Reed's bodily structure has become elastic; Sue can become invisible; Johnny can generate fire on demand; and Ben has transformed into a creature with stone-like skin: the Thing. They are later captured by Victor's men, who pose as Marines, and meet villainous monarch Dr. Doom. After escaping from Doom's men, the four regroup at the Baxter Building, trying to decide what to do now that they have gained superpowers. An angry Ben leaves the group to go out on his own, feeling he has become a freak of nature. He is found by homeless men and joins them in the lair of the Jeweler (Ian Trigger).
Victor had needed the diamond necessary to capture the comet's powers. The Jeweler would then give the real diamond to the blind artist Alicia Masters (Kat Green), who was also kidnapped by homeless henchmen working for the Jeweler. The Jeweler wants Alicia to be his bride, with the diamond as his wedding present to her. However, Doom and his henchmen locate the Jeweler's lair. Doom's henchmen first try to make a deal with him, to no avail. Doom, displeased, seizes the diamond and threatens to kill Alicia, whereupon Ben enters the room, only to revert to human form. Pursued by Doom, Ben runs out onto the city streets, frustrated at his helplessness. He somehow reverts to the Thing.
A gunfight ensues between Doom and the Jeweler's men. Doom takes the diamond to power a laser cannon that will destroy New York City. Ben returns to his friends; by now, Reed has learned that Doom is actually Victor. Realizing they are the only ones who can stop Doom, they don costumes and travel to Doom's castle. There, the Fantastic Four battle a series of Doom's military. Reed has a final battle with Doom, which ends with Doom supposedly committing suicide, though after falling into the fog, his glove, still on the balcony, starts to move. Johnny becomes the Human Torch to stand between the laser cannon's shot and the city, pushing the beam into outer space. Ben frees Alicia and finally introduces himself to her. She feels the rocky surface of his face but is not fazed by his altered appearance. Thereafter, the Four dedicate themselves to fighting evil, and Reed and Sue marry.
|REED RICHARDS - MR. FANTASTIC||Alex Hyde-White|
|JOHNNY STORM - HUMAN TORCH||Jay Underwood|
|SUSAN STORM - INVISIABLE WOMAN||Rebecca Staab|
|BEN GRIM - THE THING||Michael Bailey Smith Carl Ciarfalio|
|JEWELER (MOLE MAN)||Ian Trigger|
|VICTOR VON DOOM - DR. DOOM||Joseph Culp|
|ALICIA MASTERS||Kat Green|
|MRS. STORM||Annie Gagen|
|TRIGORIN||David Keith Miller|
|DR. HAUPTMAN||Robert Alan Beuth|
|BUSBOY||Ricky Dean Logan|
|YOUNG SUSAN STORM||Mercedes McNab|
|YOUNG JOHNNY STORM||Phillip Van Dyke|
|HENCHMAN 1||Todd Blood|
|HENCHMAN 2||Corey William Parys|