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Girls Planet 999
Genre	Reality competition
Presented by	Yeo Jin-goo
Opening theme	"O.O.O (Over&Over&Over)" by Girls Planet 999
Country of origin	South Korea
Original languages	Korean Chinese Japanese
No. of episodes	12 (list of episodes)
Production
Production location	South Korea
Running time	85–150 minutes 182 minutes (Finale)
Production companies	CJ ENM NCSoft Studio Take One[a]
Original release
Network	Mnet
Release	August 6 (2021-08-06) – October 22, 2021 (2021-10-22)
Related
Boys Planet (2023)

Girls Planet 999 (Korean: 걸스플래닛999: 소녀대전) is a 2021 South Korean reality competition show created by Mnet. It premiered on August 6, 2021 and was originally broadcast every Friday at 8:20 PM KST for the first eleven episodes until its finale on October 22, which was broadcast live at 8 PM KST. It was aired on the Mnet channel, IQIYI, AbemaTV, tvN Asia, or YouTube depending on the viewer's region.

A production by Mnet's parent company CJ E&M and its subsidiary Studio Take One, as well as in collaboration with game developer and publisher NCSoft, the aim of the competition was to debut a new 9-member K-pop girl group consisting of trainees and idols from China,^[b] Japan, and South Korea. Auditions for the competition were held from January to February 2021.

Out of 13,000 applicants, 99 final contestants were selected.^[1] These 99 contestants were split equally into three groups; the K-Group, C-Group and the J-Group.

In the finale on October 22, 2021, which was broadcast live, the show announced the final 9 members who would debut as Kep1er.

A second season named Boys Planet premiered on February 2, 2023^[2][3] featuring male trainees and idols.^[4]

Concept and format

The "planet" theme of the show was derived from a new collaboration between Mnet and NCSoft's new platform called Universe which is centered around K-pop.^[5] It allowed votes from other countries outside of the participating three,^[c] and also hosted other promotional content for the show.

The show initially grouped the girls into groups of 3 which were called "cells." An entire cell of girls could be eliminated all at once, hence increasing the risk of elimination. To counteract this, the "Planet Top 9" is introduced. Contestants who are selected or voted to be the Planet Top 9 (designated P1 to P9) can reorganize cells to try and lower the chances of elimination. Cells were disbanded after the first elimination round. At the end of the competition, the top 9 most-voted contestants debuted regardless of nationality.

Promotion and broadcast

The show, as well as its auditions, was first announced on January 11, 2021, through Mnet. Yeo Jin-goo was announced as the show's presenter on June 8, followed by the reveal of the mentors and the name of the show's opening theme later that same month.^[6] More promotional clips from the show were broadcast that month on Mnet.

The show's premiere date of August 6, 2021, was confirmed through a teaser video released on July 6, 2021.^[7] Another teaser video showcasing the faces of the 99 contestants was released on July 8, along with a promotional poster.

The theme song, "O.O.O (Over&Over&Over)," was released on July 12, 2021, accompanied by a performance by the Korean group with Kim Dayeon as Center. Another version of the performance featuring the Chinese group was released on July 14 with Shen Xiaoting as Center. The Japanese group's version was released on July 16 with Hikaru Ezaki as Center. The full version containing all three groups was released on July 29 during M Countdown, preceded by the contestants' profiles which were released from July 17 to 19 at 10 AM KST for each group.^[8] More teasers were released in July and August 2021 leading up to the show's premiere.

The show was available through Mnet in South Korea, iQIYI in China, AbemaTV and Mnet Japan in Japan, tvN Asia in Southeast Asia, and YouTube in the rest of the world through Mnet's YouTube channel, Mnet K-POP.^{[citation needed]}

Cast

The series was presented by Yeo Jin-goo,^[6] dubbed as the "Planet Master." The rest of the mentors, also dubbed as "masters," were:^[9]

• K-Pop Masters:
  • Lee Sun-mi
  • Tiffany Young
• Dance Masters:
  • Baek Koo-young
  • Jang Juhee
• Vocal Masters:
  • Lim Han-byul
  • Jo A-young
• Rap Master (Episodes 6–7):
  • Woo Won-jae

Contestants

There was a total of 99 contestants participating in the competition. 33 were Korean, and 33 consisted of Chinese, Taiwanese and Hongkongers, and the last 33 were Japanese.

The English names of K-Group and C-Group contestants are presented in Eastern order in accordance with the official website while J-Group contestants' names are presented in Western order.

Color key (In order of contestant's group rank on the show)

Ranking

Planet Top 9

The Planet Top 9 was either selected by the mentors (Episode 2) or voted by viewers of the show; those selected to be the Planet Top 9 in Episode 2 were given the ability to reshuffle and organize cells.

Color key:

New Planet Top 9[d]

#	Ep. 2	Ep. 5	Ep. 8	Ep. 9[e]	Ep. 11	Special Live[f][g]	Ep. 12
	Contestant	Contestant	Contestant	Contestant	Contestant	Contestant	Contestant
P1	Hikaru Ezaki	Yurina Kawaguchi	Shen Xiaoting (1)	Shen Xiaoting ()	Shen Xiaoting ()	Kim Chaehyun (10)	Kim Chaehyun ()
P2	Kang Yeseo	Shen Xiaoting (1)	Yurina Kawaguchi (1)	Kim Dayeon (8)	Kim Dayeon ()	Choi Yujin (3)	Huening Bahiyyih (3)
P3	Shen Xiaoting	Hikaru Ezaki (2)	Mashiro Sakamoto (2)	Hikaru Ezaki (1)	Mashiro Sakamoto (1)	Kim Dayeon (1)	Choi Yujin (1)
P4	Su Ruiqi	Choi Yujin (3)	Hikaru Ezaki (1)	Mashiro Sakamoto (1)	Hikaru Ezaki (1)	Seo Youngeun (5)	Kim Dayeon (1)
P5	Jeong Jiyoon	Mashiro Sakamoto	Choi Yujin(1)	Yurina Kawaguchi (3)	Choi Yujin (1)	Huening Bahiyyih (8)	Seo Youngeun (1)
P6	Seo Youngeun	Su Ruiqi (2)	Su Ruiqi ()	Choi Yujin (1)	Yurina Kawaguchi (1)	Kang Yeseo (6)	Kang Yeseo ()
P7	Choi Yujin	Cai Bing (1)	Huang Xingqiao	Su Ruiqi (1)	Shana Nonaka (2)	Kim Suyeon (10)	Hikaru Ezaki (5)
P8	Cai Bing	Kang Yeseo (6)	Cai Bing (1)	Kim Chaehyun (1)	Fu Yaning (2)	Guinn Myah (17)	Mashiro Sakamoto (6)
P9	Ayana Kuwahara	Kim Chaehyun	Kim Chaehyun ()	Shana Nonaka (2)	Seo Youngeun (3)	Su Ruiqi (1)	Shen Xiaoting (7)

Planet Pass

Planet Pass was a vote by the mentors, in which eliminated contestants could be brought back to the show.

The first two elimination rounds included a Planet Pass for one eliminated contestant from each group. The third elimination round included only one Planet Pass which could go to any eliminated contestant regardless of group.

First voting period

The first voting period took place from August 13, 2021 to August 28, 2021.

Voters (viewers and mentors) voted for three cells, as well as three girls of each group.

Eliminations were based on cell points, while the Planet Top 9 was based on individual points.

Color key: