muster in (verb)

1. In the fantasy novel, the protagonist is mustered in as a brave warrior to join the epic battle against the dark forces.

2. In the cartoon series, the main character is mustered in as a fearless recruit in the army of animated creatures.

3. According to Greek mythology, the heroes were often mustered in to fight alongside the gods in the various wars against formidable monsters.

4. In the superhero comic, the young protagonist is mustered in as a crime-fighting vigilante after gaining extraordinary powers.