Final answer:
Casting for the radio play 'Dark They Were, and Golden-Eyed' would involve selecting actors who can effectively convey emotional depth and transformation through their vocal performances, such as Hugh Jackman as Harry Bittering and Julianne Moore as Cora Bittering, with Ian McKellen suitable for Mr. LaFarge.
Step-by-step explanation:
If I were casting the radio play Dark They Were, and Golden-Eyed, I would consider actors who can convey the nuanced emotions and transformation of the characters in this science fiction story by Ray Bradbury. For the role of Harry Bittering, the protagonist who struggles with his identity on Mars, I might choose someone like Hugh Jackman, who has shown a wide emotional range in various roles. His wife, Cora Bittering, could be played by Julianne Moore, an actress known for her strong and stirring performances.
For their children, up-and-coming young actors who can portray the sense of wonder and adaptability would be suitable. The character of Mr. LaFarge, another settler who succumbs to the Martian environment, could be voiced by a veteran actor such as Ian McKellen, known for his deep and resonate vocal performance. These actors would bring depth and credibility to the slowly evolving psyche of the human settlers turning Martian.
In essence, suitable actors for a radio play must be skilled at using their voices to express a wide range of emotions, as visual cues are absent. The voices need to communicate the story's atmosphere and the characters' internal changes in a compelling way to hold the audience's attention solely through sound.