In spite of his stupidity, Kelso is shown on several occasions not to be immature, simply unmotivated; when he is either forced to or chooses to, Kelso displays startling intelligence unbecoming of his usual personality or hi-jinks. Near the end of the series, Kelso becomes one of the first characters to completely break away from adolescence and into adulthood when he impregnates a girl with whom he had a one-night stand; to his friends' surprise, Kelso took responsibility for the child, moving to Chicago to take a job to support and be near his newborn daughter. Kelso was first introduced in "That 70s Pilot" as Eric Forman's less intelligent, loudly obnoxious friend who is dating a preppy, younger student Jackie Burkhart whom he first met in playing fort. But later during the season the couple goes through multiple breakups. Much to his friends' annoyance, he frequently claims to be breaking up with Jackie but does not go through with it, in hopes she'll 'put out' eventually but instead, Jackie breaks up with him first. At one point, Jackie finds out and banned Kelso from coming to her ski trip, though Michael still attempts to find a way there.
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Jackie is one of the two female leads throughout the show's run and a love interest of Michael Kelso. Jackie is a self-centered, spoiled, vain member of a wealthy family. She is generally insensitive to the needs and feelings of others, although regarded by many as attractive and fashionable.
Their numerous fans call themselves "Zennies" and have since the original airing of "Cat Fight Club". Theirs is arguably the most popular ship from the show. Discussions about them thrive on social media sites such as tumblr. New Jackie and Hyde fanfiction continue to be posted each day on fanfiction.
Michael Kelso : Okay, Jackie. There are some things I haven't been honest about that I feel like you should know. Jackie Burkhart : [nods] Okay. Jackie Burkhart : Why are they here? Michael Kelso : Well, Hyde helpfully pointed out that it's not really honesty unless your friends are allowed to watch. Michael Kelso : So, anyway, I made a list. Steven Hyde : [to Jackie] The list was my idea.