Things got very hot in the kitchen last night on MasterChef (2.0/6) as the last four contestants were sliced to the final two. Not sure if it was “The most. Explosive. Episode in history” as Gordon Ramsay’s voice-over promised, but for wannabe winners Luca Manfe and Natasha Crnjac it must have been a nail-biter as they head toward next week’s Season 4 finale. The two-hour MasterChef dropped 13 from its August 28 show, a season low for the fourth cycle’s two-hour block. Even so, Fox took the top spot in adults 18-49 on Wednesday with a 2.0/6 rating. That marks the 13th of the past 16 Wednesdays that Fox has won the demo with MasterChef this summer. On the viewership side, NBC was No. 1 with 6.519 million watching. NBC came in second in the key demo with a 1.6/5 rating, while CBS took No. 2 among viewers with 5.681 million.

It was results night on America’s Got Talent (2.3/7). The Week 2 semifinals’ live one-hour show saw Fall Out Boy and iLuminate perform and six acts get enough votes to make the cut to move on to the finals. While the American Military Spouse Choir did not make it, AGT itself had a small victory as the show rose 5% from last week in adults 18-49. The top-rated show of the night, the new AGT was preceded by a recap (1.4/5) and followed by Camp (1.0/3). The Australian dramedy was up 11% from last week’s demo low tie to hit a four-week high.

Like AGT, Wednesday’s Big Brother (2.2/7) had a 5% bump in the demo from its August 28 show. Maybe it was the return of all those previously blacked out Time Warner Cable subscribers in LA, NYC and Dallas, but the longtime reality series also saw its Wednesday viewership hit a high for its 15th season with 6.60 million watching. The previous Wednesday viewership high this summer was June 26, when the show pulled in 6.51 million. The rest of CBS’ night featured repeats of Criminal Minds (1.0/3) and CSI (1.1/3). ABC’s only original Wednesday was the season finale of primetime freshman Nightline: The Lookout (1.0/3). A moderate success over the summer, the newsmagazine show was up a strong 43% from its August 28 episode.