Lois takes off to visit Francis at the academy, which might make his recent appendectomy just a little more painful. Without Lois, Hal devolves to his former bad boy personality, which turns the robot Malcolm builds with his Krelboyne colleagues into a much more destructive power than expected.—MetaControl
With Lois out of town visiting Francis, Malcolm uses the opportunity to help the other Krelboynes build a robot for a competition. As he spends his first night without her, Hal reverts to his pre-marriage persona, which may be even more crazy than the killer robot he takes over with building.—egunderson24