Not the best installment of Victorious, Rex "dying" just seemed to unrealistic to take, and a doctor who is apparently qualified wouldn't usually waste his time on a puppet, when actual sick people need his help. And exchanging it for a date with his son? Although it was entertaining, it was just too hard to fathom.
Also was Cat being locked in the mental ward. Jade was definitely the best and funniest thing about this episode. I kind of wish Rex really did "die," at least it would have brought some development, but unfortunately this episode just spelled out filler, and not a great one at that.