From the Earth to the Moon (1967)

Following the Civil War, demolition expert Victor Barbicane (Joseph Cotten) develops the world's most powerful explosive, Power X. When other countries warn that the weaponization of Power X may be seen as an act of war, Barbicane and his rival, Stuyvesant Nicholl (George Sanders), join forces to create a Power X-fueled rocket to the moon. With Barbicane's assistant, Ben (Don Dubbins), and Nicholls' stowaway daughter, Virginia (Debra Paget), the two men set forth into outer space.