6. Collision Course

The Legacy of Time
An epic six-part adventure celebrating 20 years of Doctor Who at Big Finish!

Time is collapsing. Incidents of chaos and devastation are appearing throughout the lives of one Time Lord and his many friends - all fallout from one terrible disaster. From Earth's past and present to timeless alien worlds, from the cloisters of Gallifrey into the Vortex itself ... The Doctor must save universal history - and he needs all the help he can get.

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6. Collision Course by Guy Adams

Fallout from the temporal distortions has now reached Gallifrey. To find the cause, Leela and Romana remember travels with the Fourth Doctor to the same world, at different times. The enemy is revealed, and it may take more than one Doctor to prevent the destruction of everything!

46 out of 48 (95.8%) raters say this story requires a previous story.