Main Characters Alex Kittner 2 main appearances Dr. Maddie Rhodes 2 main appearances Roland Emerson 2 main appearances President Edward Taylor 2 main appearances Lloyd 2 main appearances Martina Altmann 2 main appearances Sadie Kittner 2 main appearances Jake Kittner 2 main appearances General Vaughn 2 main appearances Renee Ferguson 2 main appearances Tom Ranfield 2 main appearances Derek 2 main appearances David Rhodes 2 main appearances