For the primary universe counterpart, see Sean Finnegan.

In the mirror universe, Sean Finnegan attended Starfleet Academy with James T. Kirk and Simon Van Gelder during the mid 23rd century.

While he was an upperclassman, he took great pleasure in bullying Kirk. However, with Van Gelder's assistance, Kirk murdered Finnegan while still attending the Academy. Kirk later commented that "[e]ven death couldn't wipe that stupid grin" off Finnegan's face. (TOS - Mirror Universe short story: "The Greater Good")

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