TOBOR THE GREAT

At his underground laboratory in Los Angeles, Professor Nordstrom (Taylor Holmes), worried that crewed space exploration is too dangerous, enlists the help of Dr. Ralph Harrison (Charles Drake), who recently left the new government-appointed Civil Interplanetary Flight Commission. The two scientists embark on a research project to create a robot that can replace humans for space flight. Nordstrom's daughter, Janice Roberts (Karin Booth), and her 11-year-old son Brian (Billy Chapin), nicknamed “Gadge”, become very interested in the project.

When a press conference is called to announce the creation of "Tobor", reporters, such as the inquisitive journalist Gilligan (Alan Reynolds), are invited to Professor's Harrison's home to see the remarkable invention. In order to undertake space travel, the remote-controlled robot has been given some human capabilities, including the ability to "feel" emotions and react via a telepathic device built into his robotic brain. Under the watchful eyes of Harrison's trusted assistant Karl (Franz Roehn), the giant robot Tobor is unveiled and then demonstrated. Unknown to the scientists, a foreign spy chief (Steven Geray) has quietly joined the group of reporters; he quickly draws up a plan to steal the robot.

While trying to perfect the robot's control systems, an inadvertent episode involving Gadge, who sneaks into the laboratory and turns on Tobor, shows that the robot can make emotional connections with people. Gadge not only controls the robot, but when he is accidentally tossed about, Tobor appears to comfort him, as if he is sorry for hurting the boy. After cleaning up, the scientists realize that an additional chair was brought to the news conference, leading them to believe that someone has infiltrated the closely guarded laboratory. Aware that their robot could fall into the wrong hands, they construct a small transmitter in a fountain pen that is able to communicate with Tobor.

An organized attack by the foreign agents is thwarted by the defensive devices at the Nordstrom's home, so the spies devise another scheme. Sending Gadge and his grandfather an invitation to a space flight presentation at the Griffith Park Planetarium, they intend to hold them hostage. When Gadge and Nordstrom show up, the spies kidnap them. Dr. Gustav (Peter Brocco) tries to force Nordstrom to provide the crucial information needed to control Tobor.

When Nordstrom and Gadge do not return for the military demonstration of Tobor's abilities, Dr. Harrison contacts the local sheriff with his concerns that something dire has happened to them. Tobor is suddenly activated, reacting to messages sent by Nordstrom, and storms out of the house, driving away in a military Jeep. Nordstrom is actually controlling the robot remotely with the pen transmitter, while trying to fool Dr. Gustav. One of the spies realizes that the pen is important and snatches it away, breaking it.

Guessing that Tobor is going to rescue the professor and Gadge, Harrison and the military follow. At the agents' lair, when the transmissions stop, Tobor comes to an abrupt halt, but Harrison successfully re-activates the robot using telepathic commands. The spies threaten to hurt Gadge, who instinctively reacts and uses his mind to call out to Tobor. Nordstrom relents, writing out the control formula. With Harrison and the military, the robot breaks down the lair's door and attacks the enemy agents, rescuing the professor and Gadge. When one of the spies attempts to drive away with the coerced information, Tobor yanks him out of his car. Gadge is then gently carried out by the robot.

Later, when Tobor has been successfully reprogrammed, a spacecraft is launched with the robot in full control of the mission.

Tobor, controlled remotely by Professor Nordstrom, rescues Nordstrom and Gadge from the spies; Tobor is ultimately rewarded with an eternal existence in space.

The ending affirms the emotional connection between Tobor and Gadge, reinforcing the film's theme that humanity and compassion can be programmed into even the coldest machinery. Rewarding Tobor with a cosmic destiny blends the era's optimism for space exploration with a sentimental farewell, wrapping up its adventure with both a nod to technological progress and heartfelt family ties.