There's no shortage of reasons to be excited for The Millers second season but get ready for two more. Yesterday, Entertainment Weekly broke the news that Billy Eichner and Rhys Darby are set to guest star when the series returns this fall. Eichner will play a character named Leon who has ties to Sean Hayes' character. While Darby will play Nathan's (Will Arnett) former classmate, Martin J.S. Essex. Get more details at EW.com.