The first season of the reality game show Pinoy Big Brother premiered on the ABS-CBN network on August 21, 2005 and ran for 112 days until December 10, 2005.^[1]

Nene Tamayo was named the show's first ever Big Winner over Jayson Gainza and two other finalists, Cass Ponti and Uma Khouny.

At the time of the launch of the franchise, the local version was the 31st version being broadcast among all the Big Brother franchises in the world.^[2] It was the second in Asia after Thailand.^[3]

The show's 12 housemates all entered during a live premiere on August 21, 2005. They were introduced in a special segment during which hosts Toni Gonzaga and Mariel Rodriguez visited their houses and asked the housemates (whose faces were pixelized) to pack up their gear, giving them a special key to signify their entry in the House.

The ages stated below are their ages at time of entry inside the Big Brother House. Origin indicates where the housemates were born or based before joining the program. Thus, August 21, 2005, is stated as Day 1.

Legend

  Housemate was given an automatic nomination as a result of a violation or a twist.

Notes

After spending 112 days* inside the house, Nene Tamayo was proclaimed the first Pinoy Big Brother winner in a grand finale on December 10, 2005. The show, dubbed "The Big Night", was held at Clark Expo Amphitheater in Mabalacat, and was broadcast live.

The four remaining housemates (Cass, Nene, Jason, and Uma), wearing blindfolds and headphones, were taken to Clark Expo Amphitheater from the Big Brother house in Quezon City by a private plane. They were then sequestered in a secret location before the actual live final. What was played on their headphones is the song Pinoy Ako by Orange and Lemons. It was played repeatedly until they went out in the secret location. Despite the rains that plagued the day of the final, 30,000 people watched "The Big Night," hosted by Willie Revillame, Toni Gonzaga and Mariel Rodriguez. According to TV ratings agency AGB Philippines, the show averaged a 39% rating and peaked at a 46% rating.

After spending 112 days inside the house, Uma was declared as the Fourth Big Placer in the Big Night finale, garnering just 52,833 votes or 4.7% of the total votes. Soon after, Cass having garnered 214,188 votes, 18.9% of total votes, was awarded the Third Big Placer status in the Big Night finale. The Second Big Placer was then named to be Jason. He garnered 312,258 votes, equal to 27.5% of the total votes.

The finale show lasted almost three hours and ended with fireworks as the Pinoy Big Brother house replica disintegrated to reveal Nene Tamayo as the "Big Winner." She garnered 554,906 votes, or 48.9% of total votes, in the Big Night finale.

This table shows the summary of votes as obtained by each of the Big 4 in the Big Night.

After the first season's run ended, a series of specials were aired relating to the program.

• Pinoy Big Brother Revealed

Pinoy Big Brother Revealed was a special documentary series hosted by Boy Abunda. Rather than just a behind-the-scenes look at the show, the series explores the concept, its popularity, the housemates themselves, the program's initially criticized morality, and its impact on Filipino pop culture, especially the rampant use of the show's logo, footage, and music by pirates. The first episode was shown live to accommodate the "Big Four," who were obviously inside the house during the taped interviews for the documentary.

• Pinoy Big Brother: Pamasko ni Kuya

Pamasko ni Kuya (English: Big Brother's Christmas Gift) was a series where the housemates' Christmas wishes are granted by the producers of the show, especially ones that involve charity work.

• Pinoy Big Brother Drama Specials

Pinoy Big Brother Drama Specials was a two-part mini-series showcasing the housemates' acting skills. It aired on December 26, 2005, and January 6, 2006.

• The Final Task

The first seven evicted housemates go on a trip to a deserted resort in Subic, where many surprises await them. Bob finds out from CB radio that the person who invited them, a woman known only as "Mother" (Gloria Diaz), has been abducted by pirates. They have to both escape from the resort and rescue her before the pirates arrive.

• Kay Tagal Kang Hinanap (English: Finding You for So Long)

Big Brother calls on Say and the Big Four to find Franzen in Baguio. Although there is a reward waiting for them upon their return to Manila, the six are not satisfied at this offer and demand Big Brother to reveal himself. It also features a cameo appearance by fortune teller Madam Auring.

Due to the popularity of the housemates, Star Music together with ABS-CBN created an album for Pinoy Big Brother entitled Pinoy Big Brother (Ang Soundtrack Ng Teleserye Ng Totoong Buhay) and was released on November 7, 2005.^[5] The album also includes music videos of the included soundtracks.