Kryon radiation was a type of radiation that was first created some time after 1888 and could be associated with Matrua Nebula technology. Shimmer suits used by the time-travelling Mac'atyde and "Sir Charles Warren" were drenched in the radiation as were parts of Mac'atyde's ship. The Eleventh Doctor's "People-Finder-Upper-Tracker-Thing" was invented to track it but he found that porridge seemed to have the same energy signature. (COMIC: Ripper's Curse)

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