Mr. Fields (initially known as Dr. Brad Matthews) is a supposed therapist whom Meg visits in "Baking Sad", alongside Stewie, Brian, and Chris.
Following a successful business venture born out of Meg crying into cookie dough, the group soon discovers that Meg is incapable of producing any more tears due to her increased happiness as of late. Mr. Fields suggests that the true reason behind Meg's better mood isn't because of her success but rather because the business granted her some quality time with her family. After deciding to prioritize Meg's happiness over materialism, the group leaves, unaware that Dr. Matthews is actually Mr. Fields, spouse of the cookie magnate, who set up the fake therapist's office as a scheme to shut down Meg Ahoy!. Soon enough, he and everyone in the building end up cackling uncontrollably and die from a gas leak.