An astro modulator was a device built by Professor Mirko Vetich and the Third Doctor to disrupt Zex's control of Mrs Prentice. It was a success and Zex was banished, freeing Prentice. (PROSE: Listen - The Stars)
Ad blocker interference detected!
Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers
Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.