Last updated on Tuesday 21 January 2014 at 04:33 UK

Watch Star Trek - Series 1 - Episode 5 Online Free

Star Trek - Series 1 - Episode 5PLAY

A transporter malfunction causes Captain Kirk to split into his "good" and "evil" selves, and a landing party will freeze to death if the crew is unable to find a way to merge the two Kirks back together.

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