During spring break, Cody (Cole Sprouse) and Zack (Dylan Sprouse) are approached to join the Gemini Project, a high-tech research center studying the dynamics between twins. Shockingly, they find themselves interconnected in a way they've never been before! When one twin experiences a sensation, thought or feeling, the other twin feels it too. While this newfound revelation helps the boys see eye to eye for the first time, it puts them in more danger than they could have imagined.