Charisma, knowledge, credentials, and character. You need all four to be a great TV host, and these celebs didnt disappoint. For this list, well be looking at the people who do the best job filling in for the late, great Alex Trebek. Our countdown includes Aaron Rodgers, Ken Jennings, Mayim Bialik, and more! Which guest host had you tuning in every night? Let us know in the comments in the form of a question or answer!

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