Final answer:
In 'Ender's Game,' Alai acts as the bridge between Bernard's in-group and Ender's outcasts, ultimately becoming a crucial ally to Ender.
Step-by-step explanation:
The bridge between Bernard's in-group and Ender's outcasts in the novel 'Ender's Game' by Orson Scott Card was Alai. Alai's unique position in the story allowed him to connect with both Bernard's group and the outcasts, eventually developing a strong friendship with Ender. Alai's ability to move between the two groups without becoming an outcast himself is pivotal to the development of the plot and to Ender's eventual success in battle school.