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“Survivor” continues to build momentum heading into next week’s two-hour finale, as Wednesday’s episode once again established new ratings records for the CBS summer smash.

According to Nielsen, the penultimate episode of “Survivor” averaged 28.67 million viewers from 8-9 p.m., outdrawing the other five networks combined (20.73 million) by 38%. Show’s audience has grown with each of its last seven installments, this week adding about 670,000 more viewers.

In key demos, “Survivor” surged to new highs in adults 18-49 (12.7/38), adults 25-54 (13.4/37), women 25-54 (14.8/39), adults 18-34 (12.9/42), women 18-34 (14.4/44) and teens (7.4/29). The 18-49 rating (12.7) tops February’s Grammy Awards telecast (12.6) and ranks as the Eye’s best demo score of the season.

Wednesday’s seg more than doubled the series’ May 31 premiere numbers in several categories, including adults 18-49 (12.7 vs. 6.1) and adults 25-54 (13.4 vs. 6.2).

Doc gets yanked

Sean, the alphabet-loving doctor from New York, was the latest “Survivor” castaway to get the boot. Next Wednesday’s two-hour finale, which includes three tribal council votes, will reveal who wins the million-dollar prize.

“Big Brother,” the Eye net’s other summer reality series, posted more winning scores in its post-“Survivor” timeslot but held a lowest-yet 61% of its adults 18-49 lead-in (7.7/21 vs. 12.7/38).

It placed first in the 9-10 p.m. hour in all key breakdowns, including total viewers (17.09 million), adults 25-54 (8.0/20) and adults 18-34 (8.0/24).