Mac Antfee is the first villain in the whole series to reform.The Ultimate Lesson from " The Ninja Identity" returns in this episode.It's probable he was held back for a couple of years in high school.It's revealed that Mac was the Ninja for six years.This is the first time Randy uses his ninja powers without wearing the suit.For the first time, someone other than Randy (Mac Antfee) is shloomped into the NinjaNomicon.This is the first episode not to feature Randy in the suit.The episode's title most likely parodies that of the famous Bruce Lee martial arts movie, Enter the Dragon.This episode has a similar name of the online game Enter the Ninja Nomicon, but they don't have the same plot.
The Nomicon reveals the reason why Mac Antfee is insane because he never took the Ultimate Lesson.
Then we know that Mac Antfee was a ninja for six years and tells Randy that in the Nomicon, anything is possible. Mac Antfee fights Randy, and shows moves that Randy didn't know of, like the Hydro Hand and Comet Sprint. He meets Randy there (who got into the Nomicon before Mac Antfee did to confront him), and talk. He opens the Nomicon in front of Mac Antfee, and Mac Antfee goes into the Nomicon. After that, Howard dresses up like a girl, and puts a math cover on the Nomicon to disguise it. Randy says that he has to somehow mindwipe Mac Antfee, and goes into the NinjaNomicon. They see Howard's sister recording with her phone, and Mac Antfee warns The Ninja to lookout and crushes the phone. Randy hides in his locker, only to be found be Howard. But when Randy talks about the NinjaNomicon, Mac Antfee realizes that Randy is The Ninja and gets crazy. Randy and Howard walk up to Mac Antfee, and Randy starts saying that he misses the feeling of being a Ninja (that Mac Antfee does). Mac Antfee returns to Norrisville and comes to the school, giving a speech about MeSplosion. Mac Antfee returns to Norrisville as a motivational speaker, only to have Randy reignite his burning desire to destroy the Ninja and take his place.