In episode 10, A Loser Presents, they return, asking for a tip. Joe is seen shirtless with an apron on in this episode. Q's dad also appears during Q's turn. Q and Murr do not get tips in this episode, and they lose.
It is seen again in Birds and the Bees. The guys come back to White Castle, this time, they work at the drive through. Q has to pretend he's sick, Murr has to slingshot a burger slider, Joe has to pretend to yell at a coworker, and Sal has to do the same "Hey Mustache" comments that were made in Costco in the first episode. Q and Murr get no tips and receive a Loss. As of these episodes, Joe is the only one to have passed all the White Castle challenges..