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This Week's TV: Adventure Time returns! Plus the Monty Python Lightsaber Battle You've Been Waiting For!

In this week's TV, a princess has to choose between piloting a blue lion and becoming Queen. And on a brand new Adventure Time, Finn discovers the truth about Flame Princess. There's a fantasy-themed TV movie about Monty Python's Life of Brian. Stephen Hawking guest stars on Big Bang Theory. Keith Mars steps up his…