The actors will appear together in the fourth episode of the upcoming third season as a couple who enter a fortune-teller's lair and face "devastating consequences," according to TVLine. The episode will apparently feature some four-legged friends, at least according to Kebbel's Twitter feed.
Kebbel, 27, is best known for her recurring roles on Gilmore Girls, The Vampire Diaries and, most recently, 90210. Amell, 24, most recently guest-starred on Pretty Little Liars after arcs on Revenge and Alcatraz.
Hawaii Five-0 surfs up with new episodes on Monday, Sept. 24 at 10/9c on CBS.