Tardis

Spoilers are precisely defined here. Rules vary by the story's medium. Info from television stories can't be added here until after the top or bottom of the hour, British time, closest to the end credits roll on BBC One. Therefore, fans in the Americas who are sensitive to spoilers should avoid Tardis on Sundays until they've seen the episode.

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Tardis
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Tardis

Z-radiation was a harmless radiation which was harnessed in the Z-battery, which was left behind by the Third Doctor in UNIT HQ after failing to jump start his TARDIS with it during his exile. The Decayed Master plotted to combine it with O-radiation on Oseidon to create ZO-radiation only to be thwarted by the Fourth Doctor. (AUDIO: The Oseidon Adventure)

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