The Eighth Doctor: The Time War 1

 was the first audio anthology in the The Eighth Doctor: The Time War audio series, which served as a prequel to the The War Doctor audio series. It was the first Eighth Doctor audio anthology in Big Finish Productions' New Series range, although the Eighth Doctor appeared in individual New Series stories before. The anthology introduced a new companion Bliss played by Rakhee Thakrar.

Publisher's summary
The Eighth Doctor battles for survival in the Time War:

1. The Starship of Theseus by John Dorney

The Doctor and his companion, Sheena, land the TARDIS on the glamorous luxury space-liner Theseus just as it's about to leave the Jupiter space-port. An opportunity for a holiday presents itself – and it's one they're very glad to take.

But when a disturbance catches their attention, they realise sinister events are taking place on board. Passengers are vanishing on every trip. And unless they're careful they may be next.

Can the Doctor and Emma solve the mystery? Or is there something else they should be worrying about?

2. Echoes of War by Matt Fitton

Colliding with the full force of the Time War, the Doctor crash-lands on a jungle world with a ragtag band of refugees.

To stay alive, they must cross a landscape where time itself is corrupted. A forest which cycles through growth and decay, where sounds of battle are never far away, and where strange creatures lurk all around.

Luckily, the Doctor has friends: not only plucky scientist Bliss, but another, much more unlikely ally. Its name is "Dal"…

3. The Conscript by Matt Fitton

Cardinal Ollistra has a new tactic to persuade the Doctor to join his people's fight. With his friends locked away, he has been conscripted alongside fellow Gallifreyans to train for the front lines of battle.

Commandant Harlan has a reputation – his camp's regime is harsh. He believes the Time Lords must adapt to win this war, but the Doctor is not easily intimidated.

Can there be any place for dissent when the Time War looms so close?

4. One Life by John Dorney

As the full force of the Time War crashes down around the Doctor and his friends, a desperate battle for survival ensues.

But not everyone is playing the same game. Ollistra is after a weapon that could end the war in a stroke and she’ll sacrifice anyone or anything to take it back to Gallifrey. Even the Doctor.

Surrounded by Daleks, and on a tortured planet, only one man can save the day. But he doesn't want to fight.

A special run of prequels to Doctor Who: The War Doctor.

Stories

 * The Starship of Theseus
 * Echoes of War
 * The Conscript
 * One Life