A SpaceX "Starman" is aboard the company's new rocket that's set to make its launch debut from Florida.
SpaceX chief executive Elon Musk revealed pictures of the surprise dummy passenger today.
Test flights usually carry steel or concrete for cargo, or mundane experiments — nothing valuable in case the rocket blows up.
But aboard the Falcon Heavy for Tuesday's demo is Musk's red Tesla Roadster. A figure is in the driver's seat, with the right hand on the wheel and the left arm resting on the convertible's door.
Starman, as Musk calls the passenger, is wearing a white-and-black-trimmed spacesuit and helmet. It's the same outfit real astronauts will wear when riding SpaceX rockets from Florida a year or so from now, bound for the International Space Station.