Ratings: S.H.I.E.L.D. Ticks Up, The Flash Returns Low, iZombie Has Some Bite, The Voice Gives Undateable a Boost

The CW’s iZombie premiered on Tuesday to 2.3 million total viewers and a 0.9 demo rating, improving slightly on Supernatural‘s most recent performance in the time slot.

TVLine readers gave the new drama an average grade of “B+.”

Opening The CW’s night, a gloriously bananas episode of The Flash did 3.6 mil and a 1.2, slipping 10 and 20 percent from its previous outing to hit a series low in the demo.

Elsewhere….

ABC | Leading out of repeats, Agents of SHIELD (4.3 mil/1.6) nonetheless ticked up 13 percent and a tenth.

FOX | Hell’s Kitchen (3.7 mil/1.3) and Mindy Project (2 mil/0.9) were flat.

NBC | The Voice (12.5 mil/3.1) slipped three tenths versus last Tuesday’s 8 o’clock hour. Now with an actual lead-in, Undateable returned to 6.5 mil and a 1.9, up 46 percent from its freshman opener (on a Thursday) and doubling its Season 1 demo average. One Big Happy‘s debut (average grade: C+) retained 5.6 mil/1.6, improving NBC’s average in the 9:30 time slot by 60 percent. Chicago Fire (7 mil/1.6) was down 19 and 24 percent from its previous episode, which enjoyed a Voice lead-in.

Want scoop on any of the above shows? Email insideline@tvline.com and your question may be answered via Matt’s Inside Line.