Carlton "Carl" Hickman is a former New York Police Department officer and former investigator in the ICC Cross Borders team. He was shot in his right hand on duty and becomes a vagabond in Europe.

Daniel recruits Carl for the ICC Investigation Team for his skills as an investigator and because he believes Carl should be "doing more than picking up trash."

Louis Daniel is the the leader of the ICC and a close confidant of Michel Dorn.

Throughout the series, Louis provides moral support and leadership necessary to hold the ICC team together. He and his wife Rebecca struggle in their relationship because she resents him for the death of their son.

Eva Vittoria is a former officer of the Nucleo Operativo Centrale di Sicurezza and current officer in Europol. She's a firm enforcer of justice because her parents were murdered in a car bomb. Only after the accident did she find out that her father was an Italian mafioso and drug dealer.

Sebastian Berger is an officer in the Berliner Polizei. He is currently the IT specialist at the ICC. Sebastian has a gambling problem, which leads him to accept gifts off the books.

Michel Dorn is the Chief Senior Investigator/Prosecutor of the ICC as well as the superior to Louis Daniel for the Cross-Border investigative unit.