Lord, Give Me Patience (2022)

S3E16 The Spoilers

After MacGyver sees a person disposing of toxic waste that is contaminating the mountain streams, he teams up with Pete to seek assistance from a solitary mountain dweller known as "Earthquake." However, their mission takes a turn when Earthquake's memories of his time in the Vietnam War start to resurface, causing him to become erratic and jeopardizing their investigation.