Cody and Zack are approached to join the Gemini Project, a high-tech research center studying the dynamics between twins. Shockingly, they find themselves interconnected in a whole new way! When one twin experiences something, the other twin feels it too. This newfound revelation helps them see eye to eye for the first time, and it puts them in more danger than they could have imagined. A doctor approaches Zack and Cody and tells them that they would be ideal for the Gemini Project, a massive project studying the effects of twins.