Arnold and Gerald pass as 6th graders to Connie and Maria and go to the 6th grade dance with them, Hey Arnold 6th Grade Girls. 6th Grade Girls is an episode of the Hey Arnold! TV series. Synopsis. Arnold and Gerald get to know Connie and Maria, who are in the sixth grade. Hey Arnold! - 6th Grade Girls/The Baseball (Season 1, Episode 5). The everyday life of Arnold, a 4th-grader in a nameless city that resembles.