Bringing together a trio of former companions, the latest tale from the Doctor’s home planet deals with the thorny topic of changing history.

While the previous Gallifrey release, ‘Intervention Earth’, took us into the distant future with a later incarnation of Romana, ‘Enemy Lines’ returns to more familiar ground with Lalla Ward’s Romana II.

Picking up on the cliff-hanger ending of that previous release, fellow Time Lord Braxiatel returns on a mission to avert a dangerous future; what follows is a complex tale of Romana’s attempts to alter the timelines against a back drop of political strife on the Time Lord home world.

In her role as President, Romana is dealing with a thorny political situation involving the other temporal powers including the Moros and the Warpwrights of Phaidon.

Engaging the services of Narvin, co-ordinator of the Celestial Intervention Agency, and his protégé, agent Ace (Sophie Aldred), she is also assisted by Leela (Louise Jameson), who fulfils the role of wise woman as much as she does warrior these days.

As well as the threat to peace in the present, there’s a more ethereal menace at play too; a Time Lord legend known as the Grey Lady, played by Eve Karpf, who both haunts the time lines and bookends the story in sinister fashion.

Closer to home, there is additional pressure from strident political rival Livia (Celia Imrie) and her sidekick Plutus (Tom Allen). Imrie, who has enjoyed a couple of cracking Big Finish roles recently, including The Prisoner, is superb as the scheming thorn in Romana’s side.

With five principal characters, when you include fan favourites Narvin (Seán Carlsen) and Brax (Miles Richardson), ‘Enemy Lines’ has the feel of an ensemble piece. However, all five get their moments to shine across the three hours; Romana being both presidential and practical, Ace disabling bombs in action hero mode and Leela using her very non-Gallifreyan skills to good effect.

Given its temporal nature of the story, David Llewellyn’s script demands your attention across all six episodes. However, that attention is rewarded as it assembles jigsaw-like at the end and rewards when the final pieces slot into place.

While there are no interview extras on this release, the superb score by Ioan Morris & Rhys Downing is provided as isolated tracks.

Released in May 2016 by Big Finish.

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