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Following a mix up, Kelly has to bring her baby brother Billy to school, and the gang must look after him.
If Zack wants to run the track meet, he better prepare his ancestry report where he gets help from an Indian.
Mr. Belding's brother Rod, a substitute teacher, arrives at Bayside to teach the gang's History class. Rod proves instantly popular, and soon Mr. Belding is dismayed to find that the kids prefer his brother to him.