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Glenn Quinn

Irish import Glenn Quinn landed his first recurring series role just two years after moving from Dublin to California, playing rebellious teen Mark on ABC's "Roseanne" from 1990 through 1997. Dark-haired, with fair skin, piercing blue eyes and brooding good looks, he played the perfect prototypical bad boy, complete with leather jacket and decidedly unpleasant attitude. The actor capably handled Mark's increased role on the show, even managing to balance his recurring part with a regular role on the short-lived 1992 ABC adventure "Covington Cross," set in medieval England. After Mark married Becky and his brother David (Johnny Galecki) moved in with the Connors, Quinn not only logged additionally screen time, he proved adept at portraying the more sympathetic and multi-dimensional character.