From the previous episode, we have Gemini VII waiting in orbit for Gemini VI-A to launch and rendezvous. Remember, Gemini VII could only remain in orbit for 14 days, the maximum duration of its flight. The goal was to launch Gemini VI-A on or before day 9 of Gemini VII’s mission.
From the previous episode, it was decided that the name of Gemini VI would be changed to Gemini VI-a to distinguish it from the originally planned mission whose objective was to rendezvous with the Agena target vehicle. Gemini VII would be launched first before Gemini VI-a and it would be considered the target vehicle effectively replacing the Agena. After Gemini VII lifted off, Gemini VI-a would be transferred to the launch pad and prepared to launch as soon as possible. After Gemini VI-a rendezvoused with Gemini VII, it would return to earth before Gemini VII.