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Season 3, Episode 7a
United States Airdate: December 1, 2007
Canada Airdate: September 23, 2008
Episode Guide
"When Johnny Comes Marching Home"
"Johnny Mustache"

Johnnyitis is the first part of 33th episode and the 65th episode over all.


Johnny drinks an isotope so he can get sick so he have to study for a test for school. Unfortunately, not only does the isotope give him red spots and a purple tongue, if it's cured within four hours, it's going to give him immense bloating, cause violent coughing, and eventually make him explode.


  • The flashback of when Susan and Mary makes the perfect smile is a clip from 101 Johnnies.
  • The Helmet Johnny wore is almost identical to the Telek-helmet in Johnny Test: Monster Starter.
  • Mom and Dad were watching World Bash Wrestling on TV from Stinkin' Johnny.
  • This is the only episiode in which Ms. Blakely is seen.
  • Dukey breaks the fourth wall in the end by talking to the audience.
  • Running Gag: People told Johnny why didn't he study.