- "Appreciably enhanced physical strength and resilience. Excels at everything he tries, particularly aviation and marksmanship—and knows it. Dedication bordering on inhuman. Ruthless leadership abilities. My favorite."
- —The Monocle[src]
Luther Hargreeves a.k.a #00.01 and Spaceboy is the leader of the team and twin brother to #00.05, The Boy. He is codenamed Spaceboy due to his accomplishment of being the youngest person ever to become an an astronaut. It is unsure as to whether Luther's codename was chosen by himself, Hargreeves or the media, as a poster of 'Spaceboy - The first boy in space' is shown in The Umbrella Academy: Apocalypse Suite.
Spaceboy was involved in a disastrous mission to Mars. His head was attached to the body of a Martian Ape and has gained all the physical abilities of one, after Hargreeves performed a life saving surgery on him.
In Apocalypse Suite it becomes clear Spaceboy has romantic feelings for The Rumor. They kiss once, but after this Spaceboy thinks he is too monstrous for her to ever love him back and have a decent relationship.
The child that would become Luther Hargreeves was born at the same time as forty-two other extraordinary children. As a baby, he was adopted by the world-famous scientist and entrepreneur Sir Reginald Hargreeves with the express intention of training them to save the world. Luther lived at the special academy set up by Hargreeves to train the children. Designated as Number One by Hargreeves, Luther displayed enhanced physical strength and resilience. His dedication to succeed led him to excel at anything he put his mind to, particularly flying and shooting. Possessed of a ruthless leadership style, Luther became Sir Reginald's favourite among the children and the leader of The Umbrella Academy team.
The Umbrella Academy
Ten years after their adoption, the Umbrella Academy made their public debut to counter the threat posed by the Zombie-Robot Gustave Eiffel and the rampaging Eiffel Tower in Paris. Luther led the team into battle which ended with the death of Eiffel and the launching of the Eiffel Tower into space. After the mission, while having celebratory ice cream, Luther expressed his desire to go into space. Sir Reginald promised him that it would happen.
Luther became the first boy in space, aided by his co-pilot Phinneus Pogo. His achievement led to him becoming known as "Spaceboy." During a further mission to the planet Mars, Spaceboy was critically injured. Sir Reginald was forced to perform emergency experimental surgery to save his life by transplanting his head onto the body of a Martian Gorilla.
Alongside his robot assistant, Ben, Spaceboy kept watch for intergalactic threats from Annihilation Control. Twenty years after the first public appearance of the Umbrella Academy, a phone call from Pogo recalled Luther from the Moon due to the death of Sir Reginald. Returning to the Academy, Luther found that Number Five had returned from the future.
- The Umbrella Academy: Apocalypse Suite
- The Umbrella Academy: Dallas
- ...But the Past Ain't Through With You