Flash Gordon
Akim the Terrible
S1 E2:
The space patrol sends Flash's best friend to investigate a planet where it is reported that mercy is a crime and the weak are exploited. The agent is captured, brainwashed and sent back to murder Flash. Thanks to Dale's timely intervention, Flash survives the attack, and the pair are sent back to the world to learn how Flash's friend was tricked into trying to assassinate his friend.