Home / Series / Numb3rs / Aired Order / Season 4 / Episode 18

When Worlds Collide

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.

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  • Originally Aired May 16, 2008
  • Runtime 45 minutes
  • Content Rating United States of America TV-PG
  • Network CBS
Name Type Role
Cheryl Heuton Writer
Nicolas Falacci Writer
Ravi Kapoor Guest Star
Michael Balsley Guest Star
Shan Ali Guest Star
Mazari Barber Ali Guest Star
Shawn Doyle Guest Star
Tiya Sircar Guest Star
Roman Mitichyan Guest Star
John Hawkinson Guest Star
Nick Jaine Guest Star
Paul Vincent O'Connor Guest Star
Kevin Symons Guest Star
Meera Simhan Guest Star
David Valcin Guest Star
Zeljko Ivanek Guest Star
John Behring Director