|Season 4, Episode 14b|
|United States Airdate:||May 17, 2010|
"Johnny Grow Your Own Monster"
|"Johnny, wait!" – Susan
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Who's Johnny? is the second part of 53th episode and the 106th episode overall.
When Sissy considers Johnny too gross to help her with their science project, he begs Susan and Mary to change his personality, as part of their grade depends on cooperation and their ability to work together.
- Johnny tries to kiss Sissy in this episode.
- The episode title is a reference to the song Who's Johnny.
- Running Gag:
- Johnny's personality kept changing when he either get hit in the head or in the machine.
- The Test Family bloodline is apparently very rich.
- The Test Family most have dog in their blood line, because Johnny turned into a dog, even though it is impossible.