The Flash‘s installment of #DCWeek’s “Heroes v Aliens” crossover event-palooza on Tuesday drew 4.15 million total viewers and a 1.5 demo rating (per finals), surging 40 and 36 percent week-to-week to beat its season highs (3.17 mil/1.3).

In fact, the speedster series delivered its largest audience in two years (Dec. 9, 2014), and its best demo number since Feb. 16.

Leading out of that, No Tomorrow (940K mil/0.3) was flat.

Elsewhere on Tuesday….

NBC | This Is Us (10.5 mil/2.7) drew its largest audience to date, up 17 percent week-to-week, while also rising 13 percent in the demo. The Voice (10.6 mil/1.9) ticked up, while Chicago Fire (7.9 mil/1.7) rose two tenths to a best-since-premiere rating.

ABC | The Middle (6.6 mil/1.6), American Housewife (5.6 mil/1.5) and Fresh Off the Boat (4.2 mil/1.3) were steady, while Real O’Neals (3.3 mil/1.0) dipped a tenth. Agents of SHIELD (2.4 mil/0.8) returned steady.

CBS | Rudolph (9.4 mil/2.3) was down a tenth year-over-year, yet still beat The Voice.

FOX | Brooklyn Nine-Nine (2.3 mil/1.0) ticked up, while New Girl (1.8 mil/0.8) and Scream Queens (1.33 mil/0.5) were flat.

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