When World's Collide

Name: When World's Collide
Director: John Behring
Released: 2008-05-16
Duration: 42 min
Rating: 8.7
Cast: Ravi Kapoor, Shawn Doyle, Željko Ivanek, Meera Simhan, Paul Vincent O'Connor

S4 E18 May 16, 2008 0h 42m ★ 8.7

Source:

Overview

In the season finale, Don and Charlie work together on a case that ends up with them going head to head about their personal beliefs, and one team member will walk away forever.