Memory Alpha
Memory Alpha

Madison was a Federation researcher involved with Project Genesis under Doctor Carol Marcus.

In 2285, he served with Marcus and her colleagues aboard space station Regula I. He was killed by Khan Noonien Singh while attempting to protect the secret of Genesis. (Star Trek II: The Wrath of Khan)

Madison was played by actor Russell Takaki. This character was only named in the source's end credits.
According to the novel Star Trek: The Wrath of Khan, his full name was Vance Madison.

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