Episode 140: "Yesterday's Enterprise" and "The Keys of Marinus" (Parts 3-4)

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

Hoai-Tran and Jacob experience some of the best Star Trek ever made as The Next Generation explores an alternate timeline with "Yesterday's Enterprise." And classic Doctor Who continues to strut its stuff with parts three and four of "The Keys of Marinus."

• Star Trek: The Next Generation: Yesterday's Enterprise - 1:31
• Doctor Who: The Keys of Marinus, Parts 13-4 - 53:56
• Episode Rankings - 1:21:51

Logo by David Scaliatine.

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