Seasons 3 and 4 only

This category is for major and/or recurring characters and elements that appeared in Seasons 3 and 4 only and were never seen in seasons 1 and 2, as seasons 3 and 4 were mainly handled by CN Studios with no involvement from series creator Genndy Tartakovsky or other head writers.

NOTE: This category is not for season 3 and 4 episodes as they already have their own separate categories.