Doctor Who: The Space Museum — Glyn Jones

When the Doctor and his companions Ian, Barbara, and Vicki enter a museum on the planet Xeros, they are astonished to find themselves displayed as exhibits The TARDIS has jumped a time track and offered them a glimpse of what the future could hold

The native Xerons are planning a rebellion against the occupying force of the Moroks who have invaded their world. The Doctor and his friends struggle not only to survive in the midst of battle, but to help change the future sufficiently to ensure their own freedom "