Nathan Fillion

Hawaii Five-0 sputtered to a series-low in the demo as Castle stormed to victory in prime time's final hour — undoubtedly with help from the Dancing With the Stars performance show that preceded it.

Read our Dancing With the Stars recap

The ABC drama attracted 12.23 million people Monday night against fresh episodes of Five-0 (9.36 million) — which had Rick Springfield, who was arrested over the weekend for drunken driving, as a guest — and Law & Order: Los Angeles (4.81 million). It also won among 18-to-49-year-olds with a 2.9 rating vs. 2.4 and 1.4 for its respective CBS and NBC competition. Castle beat Five-0 by its biggest margin yet — nearly 2.9 million viewers -- while more than doubling L&O: LA's viewership.

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In the weekly ratings that came out Tuesday, Dancing's competition program notably topped both installments of American Idol last week, when it got 22.38 million viewers at 8; Idol's performance installment was close behind with 22.32 million. On Monday night, Dancing averaged 20.88 million viewers over two hours, scoring a 4.4. demo rating.

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Against Dancing in the first hour of Monday's prime time, House sank to a season-low demo rating (2.9) while pulling in 8.48 million viewers vs. How I Met Your Mother (6.73 million) on CBS, Chuck on NBC (4.12 million) and the CW's 90210 (1.50 million). At 8:30, Mad Love on CBS scored 5.75 million viewers — up slightly from 5.57 million last week.

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At 9/8c, a rerun of CBS' Two and a Half Men reeled in 7.63 million against fresh outings of Fox's The Chicago Code (5.54 million), NBC's The Event (4.02 million) and the CW's Gossip Girl (1.28 million). At 9:30, a new Mike & Molly got 8.06 million.