Which Disneyland attraction was the first to use the Omnimover ride system?

Adventure Thru Inner Space was the first Disneyland attraction to use the Omnimover ride system.

The Tomorrowland dark ride opened on August 5, 1967, as part of the “New Tomorrowland” project. Presented by the Monsanto Company, it simulated shrinking guests to a size smaller than an atom and carried them through enormous snowflakes, water molecules, and other scenes of the microscopic world.

Riders traveled in small vehicles called Atommobiles. These vehicles moved continuously along a fixed guideway, allowing guests to load and unload while the procession continued. That efficient, constantly moving design became Disney’s Omnimover system.

The Haunted Mansion later made the technology especially famous with its Doom Buggy vehicles, leading some visitors to identify it as the first Omnimover attraction. It was not: Adventure Thru Inner Space pioneered the system two years before the Mansion opened in 1969. The attraction closed on September 2, 1985, and its Tomorrowland site later became home to Star Tours.