Between Two Worlds (audio anthology)

 was a full cast audio anthology released in November 2021 by Big Finish Productions, and the ninth release of UNIT: The New Series.

Publisher's summary
An ancient artefact, a stone arch anachronistically imbedded with electronic circuitry, is recovered following a rupture in an undersea stretch of the Mull lava group in North West Scotland, a geological feature dating from tens of millions of years ago.

UNIT’s investigation will unlock a link to another world and bring them face to face with a new and powerful threat...

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9.4