Billy's Got a Gun

Dr. Janus has another episode and pleads for Butters' help.

This short clip is a fragment from the episode City Sushi (Season 15, Episode 6)

Check out a full list of episodes from season 15

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Watch this clip on the website southparkstudios.com.

Butters' parents take him to see a specialist.

Lu Kim confronts the owner of City Sushi.

Lu Kim and the City Sushi Guy hold an Asian Diversity Assembly.

Butters gets into more trouble, as Lu Kim plans an Asian Diversity Festival.

Lu Kim and the City Sushi Guy agree to settle their differences.

Butters sits down with Dr. Janus to sort out his mental issues.

Butters informs Mr. Lu Kim about South Park's new sushi restaurant.

Searching for answers, Butters videotapes his sleep patterns.

The mystery is solved but the town decides they'd rather have Chinese food.

The turf war kicks up a notch, while Butters' mental state worsens.

Concerned over Butters' mental state, his parents take him to a therapist.

Lu Kim's terrible secret is revealed to South Park.

While visiting Dr. Janus' house, Butters discovers the doctor's darkest secret.

After Butters confronts Dr. Janus, he has another episode.

Little Tokyo's "Asian Diversity Festival" gets under way.