Costa Ronin as Martian governor Leonid "Lenya" Polivanov (Image credit: Apple TV) Acclaimed actor Costa Ronin ("The Americans," "Homeland") is another fresh face in Apple TV’s " For All Mankind " season five; his Soviet ex-cosmonaut politician, Leonid "Lenya" Polivanov, has the dubious honor of presiding over Happy Valley as the official governor of Mars. "The entourage makes the king, right?" Ronin tells Space. "The colony has grown so much, and with any growth of any colony, there’s more to do and more responsibility and more political intrigue." It can be challenging for an actor to join a show so late into its run, but Ronin has embraced that challenge. "It has been incredible to walk into a show that's been TV royalty for so many years. You walk in on set, and you get to play with your favorite actors, your favorite characters, and favorite world.…