Episode Courage is the only one to deal with madness of Immortality
Episode 3x06 - Courage follows a basically insane Immortal who gave in to his vices (opium and booze) and eventually lost his mind to it, since he can't die. Being immortal is cool and all but some people would crack mentally in that condition. I was highly pleasantly surprised that there was an episode that actually addresses this downside aspect of the immortal life. Also, the episode is not a merry one. They really decided to risk depressing the viewers with this one.
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