2x04 Cracking the Code
First Aired: Jul. 22, 2015 on CBS
Summary: As Molly works to create a virus that will eradicate alien hybrids, she discovers that aliens are trying to communicate with humans through a hidden message in their DNA. Also, Lucy helps Ethan run away from Charlie in order to help him recover memories of his mother, Molly.
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Guest Stars[no credits found]