Fans of NBC’s Friday night lineup will love this one – two of their dramas will be holding a crossover episode this Friday night. At 9PM on ‘Third Watch’ a mystery illness will be discovered in a criminal in New York City, sparking the crew from ‘Medical Investigation’ to take a trip out in an attempt to isolate and stop the contagion. The second hour, at 10PM on ‘Medical Investigation’, will continue the storyline as the MI crew are suddenly attempting to rescue an infected member of the ‘Third Watch’ team. This will be NBC’s second attempt at a crossover episode after popular Monday night dramas ‘Las Vegas’ and ‘Crossing Jordan’ exchanged characters earlier this season.