The Unheard Voice (comic story)

 was the final regular Third Doctor story in TV Action, printed in the magazine's penultimate issue. From here, the Third Doctor would return to TV Comic, TV Action's sister magazine, although TV Action would debut one more story in their 1974 annual. It was later reprinted as a Fourth Doctor comic strip story in the TV Comic Holiday Special 1978.

Summary
Returning to Earth in normal space, the Doctor's flight is disturbed by a sonic weapon that seems to originate on a remote Scottish island. He lands the TARDIS there to find two seemingly unrelated things: a Ministry of Defence installation and a natural bird sanctuary that seems very much disturbed. At the installation, he is treated as a spy until his identity is confirmed by the Brigadier. He quickly determines that the new defence satellite jointly launched by the British and American defence establishments is malfunctioning, causing sound waves in a range typically only heard by animals. These waves are driving animals crazy around the planet.

Colonel Higgs, the commanding officer of the facility, finally sees that the Doctor is speaking the truth. Since his team of scientists can't correct the satellite from the ground, he comes to the view that the satellite must be destroyed. He confers with his American counterpart, who concurs. The Americans launch a missile to destroy the satellite, but its guidance system is affected by the sound waves emitted by the satellite. The remote detonation button also fails to work, so it's up to the Doctor to take the TARDIS into closer proximity. He blows up the offending machinery, returning Earth's animal population to a state of relative calm.

Characters

 * Third Doctor / Fourth Doctor
 * Colonel Higgs
 * Nigel
 * Richard
 * Old islander
 * American officer
 * Sergeant Warburton

Worldbuilding

 * The Doctor tells Colonel Higgs that his identity can be checked with "Brigadier Lethbridge-Stewart of UNIT".
 * The Doctor's sonic screwdriver can temporarily disrupt other sonic patterns.

Continuity
to be added