What phenomenon is demonstrated when a show that is produced in the United States (NCIS, for example) becomes wildly popular in another country?

Cultural Convergence

Explanation:

The more different cultures interact, the more their values, ideologies, behaviors, arts, and customs begin to reflect each other's values is the phenomenon called Cultural convergence. In simple words when interaction between two culture increases they more they like each other. It is a result of the new communication technologies, for example, a cartoon character from Japan became popular in different cultures outside Japan.