<Tr> <Td_colspan="7"> When the school strikes oil, the kids go crazy for it after they find out how much the well is worth . However, they soon realize the costs outweigh the benefits . </Td> </Tr> <Tr> <Th> 59 (46) </Th> <Td> 12 </Td> <Td> "The Last Weekend" </Td> <Td> Don Barnhart </Td> <Td> Brett Dewey & Ronald B. Solomon </Td> <Td> October 26, 1991 (1991 - 10 - 26) </Td> <Td> 6371 </Td> </Tr> <Tr> <Td_colspan="7"> Stacey and her father fight over Zack, Kelly gets hit on by an 11 - year - old, Slater meets a girl, and the whole staff builds an enormous sand castle . In the end, even Mr. Carosi realizes that goodbyes are hard . </Td> </Tr> <Tr> <Th> 60 (47) </Th> <Td> 13 </Td> <Td> "The Wicked Stepbrother (Part 1)" </Td> <Td> Don Barnhart </Td> <Td> Brett Dewey & Ronald B. Solomon </Td> <Td> November 2, 1991 (1991 - 11 - 02) </Td> <Td> 6351 </Td> </Tr>

When does kelly come on saved by the bell