The phrase "fantastic chemistry" is an idiomatic expression that refers to a strong and positive connection or bond between two people, often used in the context of romantic relationships. Full definition
«The Lone Ranger» has its share of great moments — including some lively opening and closing set pieces and fantastic chemistry between Depp and Armie Hammer — but they're not enough to save the movie from mediocrity, because unlike the first «Pirates of the Caribbean,» it doesn't leave you wanting more. (blog.bullz-eye.com)
Not only has McDonagh collected a fantastic lineup, the actors seem to have fantastic chemistry with each other. (slashfilm.com)
The Dark Mile's biggest success is its two leads, who are both fantastic in their roles and have fantastic chemistry together. (filminquiry.com)