Launch from Cape Canaveral; landing 800 km southeast of Okinawa in the Pacific Ocean.

The main goals of this mission were, to accomplish a rendezvous and docking with the prelaunched Agena Target Vehicle (GATV 8) and to perform again a spacewalk.

The first orbital docking was accomplished without any problems, but then the Gemini capsule with the docked GATV 8 began rolling uncontrolled and continuously because of problems with the spacecraft control system (thrusters sticking probably of an electrical short). That problem was never faced in a simulation, so the crew was forced to undock, but the problems continued and were serious. After separation, loosing the mass of the Agena, the Gemini spacecraft began to roll even faster. It reached one revolution per second. The only thing to do was turn off the OAMS and switch to the reentry control system, which prompted in an early landing. So the planned EVA was not performed. Armstrong's calm headedness and his ability to recover from an extremely dangerous space emergency saved the crew.

The crew was recovered by the USS Leonard F. Mason. Three hours after landing the Mason had the spacecraft on board.