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So, I have a theory about this strip that I haven’t seen from anyone else.Garfield is immortal, albeit with long, unavoidable hibernations. Jon and Odie and the rest existed, and the events seen in the strips before this week happened. However, during his latest cycle, Jon and the cast all died. Garfield couldn’t stand to be alone, so he imagined the events of the strips after this one as a self-defense measure while he gathers the will to move on and find a new family.This could have even been his first true hibernation, thus explaining his genuine fear and confusion.