The TARDIS arrives on the planet Dulkis where the Doctor, Zoe and Jamie decide to have a quiet holiday. Only to find the Evil Dominators and their robotic slaves, The Quarks have arrived on a radioactive island, where they plan to detonate a bomb in the planet's core, which will turn the entire planet as source of radioactive fuel for their invasion fleet. Written by
Did You Know?
This serial was originally composed of six episodes, but it was deemed too short of content and reduced to five at the last minute. Producer Peter Bryant
ordered Mervyn Haisman
and Henry Lincoln
to abandon writing the sixth episode and script editor Derrick Sherwin
rewrote the fifth episode to provide a conclusion. Haisman and Lincoln were not informed of this, or of the BBC's merchandising of the Quarks, which led to their refusal to write for the series again. Subsequently an additional episode had to be penned for the following The Mind Robber, also making that story five parts. See more
The interior rear wall of the TARDIS prop is visible as the Doctor and his companions exit, revealing it to be no bigger than an ordinary police box. See more