The planet Frontios, in the distant future. Following Earth's destruction, a tiny colony struggles to eke out a life on this desolate world. But where do the bombardments that threaten them originate from? Little does the Doctor suspect that somewher... (more)e nearby lurks a power capable of ripping even the TARDIS apart…

Jeff Rawle, Maurice O'Connell, Peter Gilmore, Richard Ashley, William Lucas