Infinite Challenge

These segments were featured in multiple episodes over the years due to their popularity.

• "Infinite News" – a parody on news broadcast in which most of the reported stories happened to some or all of the cast members. Those stories revolve around their personal life and tend to balance between facts and the comedic side of them.
• "Infinite Company" – an unscripted skit that parodied on the lives of office employees, similar to The Office. Initially, the skit was a reproduction of the late comedian Kim Hyung-gon work, called President, President, Our President, portraying a situational comedy around a board of directors of a company before it was changed to be about a group of employees in a small department.
• "Ha & Su" – an unscripted situational comedy around the petty quarrels between Jeong Jun-ha and Park Myeong-su, where the latter is aggressive and hot-tempered while the former is timid and simple-minded. In 2011, they were awarded a "Best Couple" award for their performance.[15]
• "Jimotmi" – it stands for 지켜주지 못해서 미안해 (jikyeojuji motaeseo mianhae), which means "Sorry I could not look out for you" In this segment, the members play hidden-camera pranks on each other to see how they react to certain contrived situations.
• "Introducing My Ugly Friends Festival" – A segment where the members invited their acquaintances which they considered visually unappealing. Afterwards, the members organize a party where they celebrate with various games.
• "Saturday, Saturday's, I Am A Singer" – Suggested by Park Myeoung-Su and Jeong Jun-ha where the program arranges a stage where old artists were given chances to return and perform their hit songs. Sechs Kies and H.O.T. were able to reunite and came out of retirement through this segment.
• "Please, be..." – a segment which was introduced to instill common principles to all of the members. '"Please, come early"' forces the members to be punctual during filming day as the staff will not inform them when they would film the segment. '"Please, be friendly"', featuring Haha and Jeong Hyeong-don, were created to encourage both members to be more comfortable around each other.
• "Ah-Ha" – a Korean word game in which one member says a word, and the next person must then say that word backwards. Members who failed or made mistakes would be hit over the head. This segment premiered in the 2nd season (Infinite Challenge – The Master of Quiz) and was played occasionally in following seasons.
• "One-flash Telepathy" – after hearing a word which was given from the production booth, each member presented a gesture that would best represent that word. A round is cleared if all six members perform the same gesture and punishments were given when they failed. The original alleged purpose of this segment was to unite the minds of the members; however, they have yet to succeed. Voice narration for this segment was provided by Na Gyeong-eun, an announcer and Yoo Jae-suk's wife.
• Television Advertisements – throughout the episodes, the hosts create some satirical Korean television advertisements.
• Calendar-making Project – the members created a series of unique calendars and donated all profits from these sales to charity. This project has succeeded every seasons.[16]

Some of the segments of Infinite Challenge also grew and become a national event where it also actively involved the audiences as well.

• 2008 Host-in-Chief Elections – after a humorous request by Park Myeong-su to have a new leader in 2008, all Infinite Challenge members and staff held a vote for a new 'host-in-chief' on December 31, 2007, at the nation's own natural gas field near Ulsan.[17] Prior to the election, each member created campaign pledges to encourage voters to vote for them. All entertainment managers, coordinators, MBC staff and the members voted at the South gate of the MBC Headquarters and the votes were counted on the morning of New Year's Day. Afterwards, Park Myeong-su was declared the new host-in-chief, but evidence showed him of tampering the voting box. The new host-in-chief was given 3 weeks to prove his leadership skills. However, after poor performances for 3 whole weeks, Park Myeong-su announced at an Infinite Challenge press conference that he would step down and wait for the new election to take place. In the aftermath, Yoo Jae-suk was appointed as interim host-in-chief on February 2, 2008. The second host-in-chief election was held on February 4, 2008, at the MBC Dream Center in Ilsan and Yoo Jae-suk won the majority of the votes and was once again reinstated as the host-in-chief.
• WM7 – the "Wrestling Muhan 7" project is an attempt by the members to perform at a professional wrestling event. From July 2009, the members started training by inviting Sonstar, junior-professional wrestler and the drummer of Cherry Filter, as their coach and Park Myeong-su as their club leader. After numerous injuries, including a concussion suffered by Jeong Hyeong-don, setbacks and delays, the members finally put on a performance in front of a live audience on August 19, 2010, at Jangchung Gymnasium. It was broadcast over 11 episodes and MBC also released a DVD edition of this challenge, featuring several unaired segments, stories and the full uncut performance.
• 2014 Decision – the show held another host-in-chief election in 2014 where the show elected a host-in-chief with 10 years tenure. A nationwide election was held, which also promoted the citizen's participation on South Korea's 2014 local elections.[18] Similarly, the members created campaign pledges to attract viewers to vote for them in the preliminary internet polls. The second internet poll was held after the special's first episode was aired. In the aftermath of the second poll, Haha and Jeong Jun-ha decided to support Jeong Hyeong-don while Park Myeong-su forfeited to support Yoo Jae-suk. About 50,000 people, including the members of Infinite Challenge, cast their votes on May 22, 2014, on the polling stations at ten major cities on South Korea (Seoul, Incheon, Daejeon, Daegu, Ulsan, Gwangju, Busan, Jeju, Chuncheon, and Jeonju). Another 34,000 people cast their votes earlier on the preliminary voting on May 17–18, 2014. Internet voting also held at the same time of actual poll for the people who were not able to cast their votes on the polling stations and 363,047 people participated on it. Combining the live polls and the internet votes, Yoo Jae-suk won the election by defeating Noh Hong-chul with 45,310 marginal votes or 8.29% of the combined votes.
• Infinite Challenge Song Festival – started in 2007, the members randomly collaborate with real musicians in order to compete for the "Infinite Challenge Song Festival" that is held every two years.

The title of Season 1 was Rash Challenge (무모한 도전). Led by Yoo Jae-suk, six or more Korean entertainers (with Noh Hong-chul and Jeong Hyeong-don as a regular members) tried to complete a 'sporting' mission in an outdoor studio, which was based on a viewer's suggestion submitted through the show's homepage. Some of the absurd challenges included racing in a foot-powered swan-shaped paddle boat against a motor boat, playing a tennis match against Maria Sharapova, appearing live on stage at a public fashion show, and playing football against Thierry Henry. A large part of the humor comes from the fact that the cast is generally not well-suited to the challenges they attempt. This program can be compared to the filmed-in-studio Wetten, dass..? of Germany, as the program mainly focuses on the process and progress of the challenges, rather than focusing on the accomplishment of a mission.[20] This format lasted only from April 23, 2005, to October 22, 2005. Despite having a strong following, its average ratings were very low (roughly 5 percent). Due to its sports-related theme, reruns of Season 1 and sports-related episodes of Season 4 (i.e. WM7) episodes are frequently aired on MBC Sportsplus, MBC's satellite and cable network for sports-casting.

From October 29, 2005, to April 30, 2006, Season 2 was titled Excessive Challenge (무리한 도전). For the first few episodes, the program was fairly similar to the first season. However, because the cast members wanted to redefine their characters, they decided to change the whole program concept, calling it Infinite Challenge - Master of Quiz in the third season. Since then, six hosts (with Yoo Jae-suk as 'host-in-chief') played a Korean-letter game called 'Ah-ha' (see below); competed in their knowledge and mental power; participated in on-line popularity polls about specific themes; and explored other comic features.[21] Although the average ratings were low, the unity and dynamics of the members significantly improved. A panelist from Season 1, Park Myeong-su, came back as a co-host, and Haha and Jeong Jun-ha also became co-hosts of the program.

On May 6, 2006, the fourth and final season (format) of the program that now simply known as Infinite Challenge (무한도전), went on air. Special coverage of 2006 World Cup Germany was featured for the entire month of June 2006, along with some 'Ah-ha' specials (with Shinhwa, for example) at the beginning of each episode. However, on July 8, 2006, the program took its memorable first step as the first 'Real-Variety' television program in Korean television history, with the airing of a segment called 'Please, come early': The six members were asked to come to the recording session on time or experience some form of punishment (일찍 와주길 바래, a part of the 'Please, be...' series see below), combining elements of both Reality TV and Variety programming, including comic characters from each of the Infinite Challenge members, see 'hosts'). Thereafter, the program has created challenges with regard to anything related to real life (excluding some critical issues such as religions and sexual preferences), in outdoor studios, with little use of acting or heavily based plotting. Since December 2, 2006, the program has received the highest ratings of prime-time lineups for Saturday evening.[22]

In January 2012, the program took a 6-month hiatus due to a labor strike conducted by MBC's reporters and producers. During this period, new episodes were not produced and MBC, instead, aired reruns of previous episodes.[23] In November 2015, Infinite Challenge arranged special exhibition and expo titled "Infinite Challenge Expo", in KINTEX.[24] The program took a 7-week hiatus from broadcast in early 2017, which Kim Tae-ho, the main PD, signified as a period to normalize the production process which has been shortened considerably where the production team had less time and always rushed to meet the deadline. The PD also reveals that the program still continues their regular shooting schedules while being off the air.[25]

The program took another 10-week hiatus from September 9, 2017, due to a labor strike by MBC's reporters and producers. During the strike, new episodes were not aired and reruns of previous episodes were broadcast.[26] The strike ended on November 13, and Infinite Challenge returned to regular broadcasting on November 25.[27][28][29] In March 2018, the program came to an end marked by the departure of Kim Tae-ho, the lead producer, which was followed by the members. However, after the last episode was aired, the program returned for 3 more weeks where it aired recap specials that pays tribute to the achievements of the program called "13 Years of Saturdays".[10][11][12][13]

• There are a number of people who both individually work for this program and irregularly appear with Infinite Challenge members (hosts). They are frequently referred to as 'the 8th member' (제8의 멤버).

Numerous Korean celebrities have appeared on the show due to its popularity. Many of the guests have some relationships with the co-hosts of the show, including:

Infinity Challenge is famous for predicting jokes before some events occurred in real life, like The Simpsons.[66] Several episodes predicted the drama Squid Game.[67] Another episode, "Manager Jeong", Haha bought a book called American Prometheus, and about 2 months later, he wrote a book review for the book, but the contents were messy, so he made the members laugh.[68] In 2023, twelve years later, Christopher Nolan made the film Oppenheimer based on that book, Haha became the South Korean public relations ambassador for that movie.[69] Other examples purported as Infinity Challenge predicting the future include the Brexit,[70] Among Us,[66] Hangout with Yoo,[71] Koo Jun-yup and Barbie Hsu's marriage,[72][73] and Kim Shin-young's Korea Sings MC selected.[74]

The reason why this makes a lot of prophecy is that this program itself is a format in which different special features with different themes were planned every time, and even though it has been several years since the show ended, it enjoys greater popularity than active programs, and there are overflowing sources that are discovered.[75]