When Mao Mao won't admit that he's sick, he puts the town in danger. 
when they are startled
by a visually sick Mao Mao. The deputies express concern about his health, although Mao Mao denies being sick, as it would be a sign of weakness.
Approaching the scene on their aero-cycle, they are suddenly shot out of the sky and crash land in the middle of town. The monster reveals itself to be an ice dragon, having covered the kingdom in snow and ice during its rampage. Mao Mao attempts to fight, but his sickness prevents him from being effective, and is ultimately trapped in a block of ice. Adorabat and Badgerclops manage to shoot one of the dragon's wings, causing it to plummet to the ground. The monster recovers and flies away.
Mao Mao congratulates the team for their success, now looking much more sick than before. Badgerclops and Adorabat encourage Mao Mao to take a rest, but he insists that he is fine and continues about his daily duties
as sheriff. His deputies follow closely behind, destroying everything he touches to avoid getting the Sweetypies sick.
When Mao Mao tries helping a Sweetpie cross the street, he begins to hallucinate. His friends try talking to him again, only for him to pass out in a fountain. They take him to the castle to be treated by the magical technicians, Camille and Honey. Camille tries to cure
Mao Mao using a giant leech, but he sneezes inside its mouth, causing the creature to flee is disgust. Suddenly, the ice dragon returns to continue destroying the kingdom. Badgerclops and Adorabat go to fight the monster, leaving Mao Mao to rest. Mao Mao tries to get up, but sees his reflection in his sword and relents
that he is sick.
Adorabat distracts the monster while Badgerclops charges his new "Badger Blaster" attack. Firing a massive laser at the monster, it counters with a blast of ice which overpowers Badgerclops and leaves him trapped in ice. Adorabat is soon frozen as well. Back in the lab, Mao Mao feels bad being unable to help. Camille wonders
why Honey is now wearing a hazmat suit; the flying squirrel points to a poster on the wall that shows how germs can spread. Mao Mao looks at the poster and gets an idea on how he can defeat the monster.
Back outside, the ice dragon prepares to finish off Badgerclops and Adorabat. Mao Mao hobbles towards them, barely able to stand, and draws the beast's attention. The dragon tries to freeze the sick sheriff, but his intense fever makes him invulnerable to the creature's icy breath. The monster responds by eating Mao Mao whole. He retaliates by rubbing his
body all over the inside of the dragon's mouth, causing it to become extremely sick and explode. The trio celebrate their victory with a hug, only for Badgerclops and Adorabat to get sick as well.
Back at their home, the monster alarm goes off, but is unceremoniously turned off by being hit with a kunai. The heroes are taking a sick day, watching TV together on the sofa. Mao Mao remarks that they should take sick days more often, as Pure Heart Valley sets on fire in the distance.
- Giant Leech (debut)
- Ice Dragon (debut/death)
- King Snugglemagne
- Mao Mao
- Slim Pigguns
- Despite owning a poster on the topic of hygiene, Camille was unaware of how germs spread.
- It is also revealed that Camille has a collection of germs/snot, which is the source of the mass infection in this episode.
- As of March 2020, this episode is unavailable on the Cartoon Network app due to the coronavirus epidemic, as a means to avoid audience discomfort.
- Sick Mao, along with Mao Mao's Nakey are the among the lowest rated episodes of the show on IMDB, both scoring an 8.1.
- Badgerclops is seen sleeping on the top bunk bed, which was given to him in "Ultraclops".
- The title itself is a literal translation of the Chinese phrase 病貓 (sick cat), which is used for describing somebody who is severely under the weather.
- What Mao Mao says in the dragon's mouth is a reference to the Domon Kashuu special attack called "Shining Finger Sword" from the anime "Mobile Fighter G Gundam". Interestingly, the music is a nod to G Gundam as well, called Shining Gundam (シャイニングガンダム).
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