The TARDIS brings the 5th Doctor and Nyssa to a forest in the rain. They head for a spooky mansion at the edge of the forest only to discover they are expected for dinner along with several other bemused time and space travellers.
Their host is revealed to be the Master who challenges his guests to escape. Simply that- escape.
Frightened and despairing the guests scatter, some through the house, some into the woods where they are hunted by strange creatures.
The Doctor discovers that the TARDIS is now just a shell and cannot offer any sanctuary.
Running further through the forest he reaches a kind of glass barrier and beyond it is deep space...