Captain 7 is a good captain, and the first female captain. She (yes, she, if you have no idea what female means) is Captain 0's sister. She is beautiful, but she's asexual, meaning she's not attracted to anybody.
Captain 7 was born when Cyber-Dee felt that Captain 0 needed a sister. So, the undefeatables went in their lab to create the perfect sister. They used an iMac to create her the same way they created Captain 0 on a PC. The rest of the story is unknown at this time.