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As a human, she served as a lieutenant commander on the USS Nelson in the 2370s.

In 2399, at the age of 65, Morrison was presumed dead when her shuttlecraft fell apart while in transit to a Federation planet. In reality, after the shuttle had started to come apart, an unknown sorquine had entered and "assimilated" Morrison, turning her into a sorquine as well so she could survive the vacuum of space. She was picked up three hours later by the USS Paramaribo.

Her parents were still alive as of 2405.