Kate Stewart and her UNIT team investigate and confront alien attacks on the planet Earth in the new 5 disc boxset. Something is stirring, an old foe to those in UNIT with a long memory. And fortunately, to face an old foe...There are old friends. 4.1 Call to Arms by Matt Fitton.Mike Yates braves a stormy night in the Lakes to help celebrate a milestone for John Benton. An evening of fond reminiscences of old glories and friends awaits. But a long-buried past is about to catch up with them. Meanwhile, on the rain-lashed moors, what begins as a routine mission for modern-day UNIT quickly becomes a fight for survival. 4.2 Tidal Wave by Guy Adams. When an experimental tidal power generator needs its eco-friendly credentials checked, Kate Stewart calls in an expert. Soon, Jo Jones is bound for 'Project Charybdis' in the South Atlantic, along with an awestruck Osgood. But out at sea, a treacherous plan is set in motion to awake an ancient race. Beneath the seabed an army is sleeping - an army of Sea Devils! 4.3 Retrieval by Guy Adams. As the Earth's primeval rulers reclaim their birthright, UNIT must stand against them. And Kate Stewart and Osgood must venture into a Mediterranean stronghold to retrieve a means to fight back. But a Silurian warrior is on their trail. Once she has the humans' scent, Commander Tryska will never give up the hunt. 4.4 United by Matt Fitton. The Silurians hold Great Britain under siege. Grand Marshal Jastrok rules the seas and the skies with reptile forces. On the ground, Commander Kalana crushes all ape resistance. With Kate Stewart trapped, defence of the realm falls to UNIT's old guard. Jo Jones, Mike Yates and John Benton are ready to do their duty and stand united. Launching with last year's Extinction, UNIT - The New Series was the first Big Finish range to use characters from the BBC mega-hit 21st century relaunching of Doctor Who! In this thrilling full-cast audio with cinematic sound design and music, Jemma Redgrave and Ingrid Oliver reprise the fan-favourite characters of Kate Stewart and Petronella Osgood as seen on TV in stories such as the globally cinema-screened Doctor Who - Day of the Doctor. The set's foes - Silurians and Sea Devils -are some of Doctor Who's most popular monsters. This is the first time the Sea Devils have appeared in a Big Finish production in nearly 14 years, something highly anticipated by the TV show's fans. CAST: Jemma Redgrave (Kate Stewart), Ingrid Oliver (Osgood), James Joyce (Captain Josh Carter), Ramon Tikaram (Colonel Shindi), Fernandez (Captain Gonsalves/ Phoebe Breckenridge), Lucy Fleming (Alice Donelly), Matthew Cottle (Ben Donnelly/ Overseer), David Jonsson (Corporal James Morley), Dan Starkey (Marshal Skar/ Commander Merx/ Sontaran Escapee), James Wilby (Professor John Torrance), Beth Goddard (Christine Colley) and Nicholas Briggs (The Daleks).