Evolution: [s2e7]

This episode is noted for returning to the "case of the week" formula of the original series while still advancing the overarching "Gold Star" mystery.

: The team hunts Roger Song , a man who kidnaps sperm donors and dissolves their bodies in an acidic shower. He believes he is punishing men who harmed his wife, but it is eventually revealed his wife and child died during a home birth, and he is acting out of a delusional psychological break. [S2E7] Evolution

In this episode, the Robinson family and the crew of the Resolute face mounting tension as they search for a secret audio signal. : This episode is noted for returning to the