Worlds Collide: 15 Times Your Favorite Characters Appeared On A Different Show

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Hetty on Scorpion

Walter O'Brien and the rest of Team Scorpion enlisted NCIS: Los Angeles' Hetty Lange when a case involving a priceless painting took them to a Halloween party. Her expertise helped them go undercover and infiltrate the event.

Watch Scorpion on Mondays at 10/9c CBS and CBS All Access.