The phrase "incredible chemistry" is an idiomatic expression that refers to a strong and positive connection or bond between two people, often characterized by mutual attraction, understanding, and compatibility. Full definition
There is incredible chemistry between the four leads, and it makes you wish they had the opportunity to work together more. (theretroset.com)
CHEMISTRY MYTH # 1: you need to have incredible chemistry with someone to pursue a long term relationship with them. (executivesearchdating.com)
There is so much to love about the film, from the performances by leads Armie Hammer and Timothée Chalamet, who make an impressive career turn and lead actor debut respectively and establish incredible chemistry, to the haunting classical - meets - nu - wave - pop soundtrack. (independent.co.uk)