Reappears as a mysterious figure who breaks into the team’s bunker. He reveals he has been investigating the same group independently and provides the team with the remaining names of the Collaborators.
In episode 18 of Quantico Season 2, titled the joint FBI-CIA task force faces its most demoralizing challenge yet as the "Collaborators" attempt to incite a domestic riot to fracture the country and undermine President Claire Haas. Plot Breakdown
Caleb Haas makes a surprise return, using his unconventional style to challenge his brother Clay’s fatalism about the task force's failing progress.