Episode Title:Invasion.Episode Description:Zach can't make it in time to "The Albert Einstein School for Gifted Youngsters Science Fair," and his daughter Jessie is upset when big brother Zach Jr. comes in his stead, sure that Dad will be there was soon as he can. However, the fair is suddenly overrun by tiny cowboys and indians armed with mini-blasters, and it's up to the kids to save the day from this toy invasion.