The Answer is the fourteenth episode of Season 6. It aired on February 18, 2015.
Boasting of his new relationship status with Cindy, Brick vows to end his "whoops" and "whispers". Axl returns from his date with Devin and claims he can fix Brick's quirks, based on what he's learned in his psychology class. During dinner, Sue reveals she panicked and said "sure" to marrying Darrin. Mike angrily says he is going to kill Darrin, but Sue intervenes and says she needs to handle it. Meanwhile, Axl tries out several different methods to cure Brick, and ultimately isolates the issues to the lawn chair Brick was forced to sit in at the dinner table. After several failed attempts, Sue finally tells Darrin she has many other things she wants to do before getting married, and breaks off their engagement.