Former Starfleet officer turned terrorist, leads swarm attacks on Yorktown.
Their conflict drives the central survival and defense storyline.
Krall destroys the USS Enterprise, captures its crew, and plans to attack Yorktown. Captain James T. Kirk pursues him and ejects him into space.
Jaylah's personal history with Krall's forces motivates her resistance.
Jaylah previously escaped Krall's encampment after her father was killed, and she helps the survivors fight against Krall.
Kalara operates as an agent within Krall's attack plan.
Kalara arrives on the USS Enterprise claiming to need rescue, but Kirk discovers that she is secretly working as Krall's spy.
Krall threatens the base and the authority responsible for its defense.
Krall launches the completed bioweapon and his drone swarm toward Yorktown, whose operations are overseen by Commodore Paris.
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Related entry on Wikidata (Q58417612), public domain (CC0).