Polly Wright has tracked down an old friend of the Doctor's... Alistair Gordon Lethbridge-Stewart, former Brigadier at UNIT. As they trade stories of their time travelling in the TARDIS, it soon becomes clear that their pasts are intertwined, and linked to a current crisis on the planet Earth. And there's a third companion, watching them from a distance. A certain Thomas Brewster... An epic story featuring the Doctor's former companions Polly, Brigadier Lethbridge-Stewart and Thomas Brewster in a fight to save the Earth, The Three Companions was previously released in serialized form and is available to hear in a new compilation edit for the first time.