The Yesterday Saga is a Star Trek: The Original Series mini-series by A.C. Crispin. The mini-series was created by Pocket Books in 1999 when they were re-publishing many Star Trek books. They are sequels to TOSepisode:All Our Yesterdays wherein Spock was sent back in time via the Atavachron to ancient Sarpieden and met Zarabeth.

The Yesterday Saga contains the following adventures:-

• Book 1: Yesterday's Son.
• Book 2: Time for Yesterday.

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