Before I start off, let me just say...Johnny Test is the worst, most selfish, uncaring, unfunny, stupid and overall worthless protagonist for any show I have ever seen! I can't believe I actually used to kind of like this show, but yeah, I did when I was like 10. Now I look at it and say 'wow, what a piece of crap'.
The whole prospect had been done to death: genius kids that can make any technology imaginable lose control of their inventions and have to stop them while learning life lessons at the same time. It's almost an exact clone of Jimmy Neutron except where that show was good, this one just hurts me. None of the characters except the dog are likeable and they never have any development; even Johnny Test himself...I mean, they try to get some messages through but you can just tell their hearts aren't in it, and by the next episode Johnny is back to being his butthole self. The villians are stupid, unfunny and have the stupidest names ever...Wacko? Mr. Mittens? Bling Bling Boy? Sounds more like a second grader's attempt at fanfiction than a show that could actually air on CN. This show just sucks. I give it two stars because I really like Dukey the dog (but yeah, even the dog's name is potty humor, that's pretty bad) because he's clever and seems to be the only character they put time into. Just stay away from this show.