'Brothers & Sisters' exclusive: The flashback episode details you don't know

Brothers-and-Sisters-ABC-320.jpgNews surrounding the " Brothers & Sisters" flashback episode on Sun., April 11 is at a fever pitch!

Last night, we reported that "Beverly Hills, 90210" alum Daniel Cosgrove has been dropped due to scheduling conflicts. Stepping into young William Walker's shoes is " Melrose Place" hunk Colin Egglesfield.

ABC now confirms to Zap2it that Brianne Davis is playing young Holly. Davis starred in the horror flick " Prom Night" and recently appeared in an episode of " Desperate Housewives."

But that's not all we know. Here are some exclusive details:

Warning: Spoilers!

  • Hour one of the two hour special is shooting now and wraps on Mon. Feb. 22. It takes place in 1986 (interspersed with the present). The Walker kids are mostly teenagers, but Justin, the youngest, is only four-years-old. Awww.

  • Hour two starts shooting on Tue. Feb. 23, but the script has yet to be finished! It takes place in 1973 (again mixed with scenes from the present). Contrary to other reports, Egglesfield and Davis, young William and Holly, respectively, only appear in the second hour. Zap2it is happy to set the record straight!

Are you psyched for the Walker stroll down memory lane?

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Photo credit: Miranda Penn Turin / ABC