Five Weeks in a Balloon is a 1962 American adventure film loosely based on the 1863 novel of the same name by Jules Verne filmed in CinemaScope. It was produced and directed by Irwin Allen; his last feature film in the 1960s before moving to producing several science fiction television series. Although set in Africa, it was filmed in California. Balloonist Don Piccard acted as the film's technical advisor. For visual effects, a model of the balloon was used as well as a full-sized unicorn gondola hung from a crane. A novelisation of the screenplay was written by Gardner Fox. Plot It is 1862 in England. The Jupiter, a manned balloon with a unicorn-shaped gondola, falls from the sky during its maiden flight. Passenger Sir Henry Vining (Richard Haydn) and his treasurer (Ronald Long) scream in horror. However, Professor Fergusson (Cedric Hardwicke), the balloon's inventor, remains calm, as he planned on giving a dramatic demonstration showing the balloon's controls. On his signal, pilot Jacques (Fabian), ascends the balloon using a pressure gauge that ensures no loss of gas or ballast. Traumatized by their "near-disaster", Sir Henry, head of the Royal Geographic Society, and his treasurer refuse to fund Jupiter'''s exploration of East Africa, and walk out on the professor after landing. American publisher Cornelius Randolph comes to the rescue: He will back the venture if his star reporter and nephew, Donald O'Shay (Red Buttons), joins the crew. Unbeknownst to the professor, who is told by Randolph that O'Shay is an "inoffensive young man", O'Shay is notorious in the press for his troublesome antics as a playboy. On the day Fergusson intends to set sail for Africa, he learns that his expedition is halted and that plans have been changed. At the British Parliament, the prime minister commissions Fergusson to defeat a convoy of slave traders heading toward uncharted land near the Volta River in West Africa. The slavers aim to stake their claim within six weeks and take over the territory. Fergusson calculates he needs only five weeks to cross Africa by air and plant the British flag at the river. The Prime Minister recommends that he take O'Shay along as a neutral witness to the planting of their flag. However, he did not calculate the Queen sending along Sir Henry, who proclaims himself to be the "expert on Africa" and demands to be called the "General". While Fergusson meets