In this episode of Trekking Through Time and Space...

Hoai-Tran and Jacob meet Data's evil twin brother with "Datalore." But who can think about that when they're saying goodbye to David Tennant and the Tenth Doctor with "The End of Time."

• Star Trek: The Next Generation: Datalore - 2:38
• Doctor Who: The End of Time - 54:42
• Episode Rankings - 2:18:20

Logo by David Scaliatine.

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