Saved by the Bell : The Fabulous Belding Boys (1990)
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Synopsis by Matthew Tobey
When Mr. Belding's hip younger brother, Rod, fills in as a substitute teacher, the gang immediately takes a liking to him, much to the chagrin of the straight-laced principal. But when Rod's freewheeling demeanor proves to be part of an overall unreliable and irresponsible personality, Zack develops a newfound appreciation for Mr. Belding.