Big Brother 1 was the first season of the first reality show in Bulgaria - Big Brother. The show was aired on Nova Television. It started on 18 October 2004 and ended on 17 January 2005 and it was hosted by Niki Kanchev and Evelina Pavlova. The winner was Zdravko, who won 200 000 leva. He also participated in the second season of VIP Brother - the season was won by his wife.
12 Housemates entered the House on Day 1, and another 1 on Day 18. Veneta and Zeyneb entered on Day 50.
Alidzhan Aliev is from Sofia. He entered the house on Day 1 and was the eighth evicted on Day 85.
Anelia Ivanova is from Sofia (born in Ruse). She entered the house on Day 1 and was the first evicted on Day 22. Disappointed with her participation, Anelia returned to Italy, where she lived before the show.
Dimitar Kazalov is from Sofia (lives in London). He entered the house on Day 1 and left voluntarily on Day 17.
Margarita Grigorova is from Kyustendil. She entered the house on Day 1 and was the third evicted on Day 36.
Mariela Kiselkova "Mel" is from Sofia (born in Veliko Tarnovo). She entered the house on Day 1 and was the fifth evicted on Day 57. She had a brief lesbian romance with her roommate Svetlozara and made love to her.
Nayden Naydenov is from Sofia. He entered the house on Day 1, but was ejected on Day 48 along with Svetlan for aggressive behavior. After an incident in which they both started vandalism (breaking things in the house), the nominations were cancelled and there were open special telephone lines - the viewers had to decide whether they should be punished. They had four choices - to eject Nayden, to eject Svetlan, to eject both of them, or both of them simply to stay in the house. Nayden celebrated his 25th birthday in the house - there was a party in which Zara came out of a big cake. They had sex the same night.