The producers of this franchise were so mean
It all started off as "Good Morning Miss Bliss" in 1987. Starring: Haley Mills (Ms Bliss) Mark Paul Gosselaar (Zach) Dustin Diamond (Screech) Max Battimo (Mickey) Heather Hopper (Nicki) Lark Voorheis (Lisa) Dennis Haskins (Mr Belding) Joan Ryan (Tina Palladrino) and the actor who played Milo
When Saved By the Bell came along: Miss Bliss, Mickey and Nikki were dropped, as was Ms Palladrino and Milo, but the two latter were not so vital, so it wasn't too bad. But Miss Bliss, Mickey and Nikki should had been allowed to continue rather than getting shafted.....In place of Nikki and Mickey they get Slater and Kelly, and in addition add Jessie
Now the College years. They drop Jessie and Lisa, and just keep all the boys from Saved by the Bell and Kelly.
I don't think that was nice at all how they treated Lark Voorheis (Lisa) after all her hard work in "Good Morning Miss Bliss" and in "Saved By The Bell" and to just have Jessie on temporarily on the franchise must had pissed her off