In each episode the hosts help a different individual with a different story, travelling to wherever they live and using background checks and research to uncover the truth.
Nev and Max contact the other person to arrange a first-ever meeting between the two virtual lovers, then document how both people are impacted.
In Season 3's Miranda and Camryn episode, the catfish did change their mind about meeting the hopeful, and only appeared via Skype.
The hosts are given no information about the catfish, and while the catfish has already agreed to appear on the show, they do not know when or how the hosts will be looking for them.
Producers then proceed to gather information about the deception from the catfish and contact the hopeful afterwards.