Zack's only surviving son, whose relationship with his father is strained. He is wrongfully framed with marijuana by the corrupt sheriff, sentenced to hard labor without counsel, and later takes command of the Sherman tank after Zack is injured during the rescue mission.
Zack is Billy's father, initially estranged but ultimately protective.
LaDonna actively works to secure her son's legal safety.
Sarah and Billy function as equal members of the tank crew.
Hubik's military authority indirectly governs Billy's fate.
Explore the full interactive character relationship map of Tank