We also know that a sixth sibling hinted at in the series finale—which would push Malcolm out of “the middle”—will be included: Vaughan Murrae will play Kelly, the family’s youngest child and only daughter. Other newcomers include Keeley Karsten as Malcolm’s daughter and Kiana Madeira as his girlfriend.

Muniz has faced a string of disappointments while competing in NASCAR's Craftsman Truck Series. Frankie Muniz opened up about his current frame of mind on social media Monday. "If I'm being 100%

Here's a look at Frankie Muniz, Bryan Cranston and Jane Kaczmarek on the set of Disney+'s four-episode Malcolm in the Middle return series.