<P> Because cast and crew believed that the eighth season of Roseanne would be its last, Goranson had signed back on only for that season . These changes are addressed within the show and become a running gag throughout season 8 as both Goranson and Chalke continue to alternate in the role of Becky, depending on Goranson's availability . During season eight, Goranson is credited in the opening sequence as a full - time cast member, and appears in 11 out of 25 episodes . Sarah Chalke makes five appearances and is credited as a guest star . In the show's ninth season, Chalke replaced Goranson full - time, and no further "in - jokes" about Becky's casting are made . </P> <P> At the end of the Season 9 finale, it is hinted that Becky is pregnant . She did not want to mention it to the family . In the same episode, it is also revealed that Becky had actually been dating David all along in reality, but was written in Roseanne's book as having been with Mark instead, as Roseanne felt it made more sense . </P> <P> Played by Johnny Galecki . David is Mark's younger brother; he first appeared in "The Bowling Show" (episode 4.14) when his first name was indicated to be Kevin . In a season 6 episode Roseanne comments that David isn't his real name, it's just something that Darlene made up . So it's possible that Kevin really is his name although everyone including his own family call him David and Roseanne might not have been serious . Whereas Mark was a rebellious delinquent at first, David is friendlier to the Conners . He's shy, polite, thoughtful, sensitive, soft - spoken, artistic, and intelligent . He later enters a relationship with Darlene and collaborates with her by illustrating graphic novels that she writes, though he tends to be the more submissive one in the relationship . His well - behaved manner is endearing to the Conner family, who think of him as part of the family and jokingly refer to him as being more welcome in the family than Darlene . He moves in with the Conners after Roseanne, herself a victim of child abuse, sees how abusive David's mother is to him . David and Darlene break up three times throughout the course of the show, each for a longer period of time than the last; they always end up back together . Eventually, David impregnates Darlene; causing them to decide to get married . In the series finale, Roseanne reveals that David had actually been dating Becky in "real life," and that Roseanne simply wrote his relationship as being with Darlene because she felt it made more sense . </P> <P> Played by Glenn Quinn . Mark dates and later elopes with Becky, much to the Conners' consternation . Despite Mark's tough - guy image and rebel persona, he is rarely seen to engage in criminal activity . Roseanne initially had a strong dislike for Mark because of his condescending attitude toward her . Dan initially dislikes Mark as well; Mark's choice to ride a British Triumph motorcycle rather than an American Harley - Davidson causes particular tension . However he soon respects Mark's work ethic and hires him as a mechanic both at his bike shop and his truck - inspection office . Mark's personality changes drastically over the course of his duration on the series--he starts off as a rebellious delinquent, but ultimately proves himself to be a caring and responsible (although dull - witted) husband and brother . Roseanne and the rest of the family eventually grows fond of Mark, though they still get amusement out of insulting him . He has a younger brother, David, who dates (and later marries) Darlene . He also has two much younger little sisters, Lisa and Nikki, who appear briefly in the season 5 episode "No Place Like Home for The Holidays ." In the series finale, Roseanne reveals that Mark had actually been dating Darlene in "real life," and that Roseanne simply wrote his relationship as being with Becky because she felt it made more sense . </P>

Who played david in the tv show roseanne
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