Victorious if I have my facts (https://moviechat.org/tt1604099/Victorious/58c7d823f9fcca09a0e6e4d9/VictoriousSam-and-Cat-timeline) straight, never had a proper series finale (List_of_Victorious_episodes#Season_4_(2012–13)). Also, Sam & Cat presumably takes place concurrently with Victorious, hence why Jade, Robbie, and Sikowitz all appeared as they did. not to mention, we saw the 'backs' of the cast members during the Sikowitz episode (https://en.wikipedia.org/wiki/List_of_Sam_%26_Cat_episodes).

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