Derek Morris is the father of Zack Morris.
He appears in Rent A Pop when Mr. Belding makes Zack tell his dad to meet with them. Not wanting that to happen he hires an actor to play his dad and according to Mr. Belding it went so well that he wants him to go on the ski trip so he writes them a letter when Zack's dad goes to the school, Mr. Belding is distracted by Screech while the actor plays Mr. Belding but when Zack's dad goes outside to the carnival and Mr. Belding taunts him attracting the of Zack’s actual dad. Back at Zack's house him and Zack have a talk where Zack admits what he did and also tells him that he's too involved with business.
He’s also depicted in Good Morning, Miss Bliss, where he dates Miss Bliss which is retconned in Saved By The Bell since he never divorced Zack’s mom. He only appears in Saved by the Bell original series however he did appear in the movie Saved by the Bell: Wedding in Las Vegas attending his son wedding to Kelly along-with his wife.
- In Good Morning, Miss Bliss, Zack's father was named Peter Morris. Played by actor Robert Pine, he was divorced and briefly dated Miss Bliss. This background was completely changed when the show was reworked into Saved by the Bell.