(How) Can I get the Metropolitan line from London St Pancras Intl?

I think the Metropolitan line is part of London's underground…

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Answer:
yes, the Metropolitan is an underground line … when you get off your train at St Pancras Intl look for the underground sign … see the circle with the horizontal bar across like on the bottom right of this tube map

http://www.tfl.gov.uk/assets/downloads/s…

follow these signs to Kings Cross St Pancras underground station and then look for the purple signs for Metropollitan line (there are 6 different underground lines going through this station) … you will need to know whether the station you're heading for is on the east or west part of the line to get to the right platform

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Answer:
Yes the Metropolitan Line stops at Kings Cross / St Pancras (combined station), just look out for signage to the underground, then follow directions towards it.