Johnny Galecki Returns as David on "Roseanne" With the Craziest Story Line

We learned that David and Darlene never actually divorced, and stayed separated while David traveled the world doing charity work. David snuck into Darlene's room through her bedroom window, because he was afraid of the wrath of Dan, and begged Darlene to let him in. "Please? I'm a vegan now, ...

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