It's two firsts for Mark: a first date and a first trip to another planet. At the same time, Nolan and Debbie revisit their own first vacation together.

Cast: Sandra Oh, J.K. Simmons, Steven Yeun, Zazie Beetz, Walton Goggins, Gillian Jacobs, Jason Mantzoukas, Zachary Quinto, Clancy Brown, Chris Diamantopoulos, Grey Griffin, Kevin Michael Richardson, Zehra Fazal, Djimon Hounsou, Khary Payton