Johnny Test: Johnny's Royal Flush // Johnny Test's Day Off

Johnny is accidentally turned into a fish during an experiment to see if dolphins respond to trash talk. His sisters, Susan and Mary, attempt to turn him back but need to fix their DNA converter.

Johnny's dad, unaware that Johnny is a fish, flushes him down the toilet. His sisters realize he's in the sewer system and use a GPS locator to track him.

Johnny, now a fish, must survive the dangerous sewer system, encountering various flushed objects and a sewer gator. His sisters attempt to rescue him, leading to a chase through the sewers.

Johnny and his sisters, along with other flushed fish, narrowly escape being processed at the sewage treatment plant thanks to Johnny's quick thinking and an unlikely dental drill.

Johnny fakes being sick with a concoction of baby food and a hairdryer to get a day off from school. His parents fall for the trick, but his sisters are reluctant to participate.

Johnny and his sisters must evade a truant officer who is looking for them. They hide in various locations, including Johnny's closet, a baseball game, and an arcade.

The truant officer, equipped with rocket shoes, chases Johnny and his sisters through the park and a movie theater. They eventually escape and make it home, claiming to have had a great day at school, much to their dad's surprise.