The main stars are going to be joined by actor Boo Arnold as Ranger Art Hansen in the upcoming episode.
As of yet, very few details have come out regarding what will happen in Horses in Heaven, as well as what the Ranger's role will be.
Arnold has cropped up in a plethora of shows and films during his 17-year acting career.
Some of these include Veronica Mars, Desperate Housewives, Big Love, Criminal Minds, CSI: NY, Blackout, Nashville, The Mentalist and Scandal.
