=== Occasional Appearances ===
* 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).
!| Character Description and Notes
| [[Defconn (rapper)|]]<br />(Yoo Dae-joon 유대준)
| Daepho-phone(대포폰)<br />Peh-conn-ie(프콘이)
| Singer<br>Long-time buddy of [[Jeong Hyeong-don]]<br>Member of "[[...|Hyeongdon and Daejoon]]" [[Hip hop music|hip-hop]] duo (형돈이와 대준이)
| Since MuDo's ' challenge' during the Spring-Summer season of 2011, he is the frequent pinch-hitter of this programme, while one or more cast members in absence.
| [http://cafe.daum.net/mcthemaxjsk Jeong Seok-kwon]<br />(정석권)
| Manager Jeong<br /> (Jeong Sil-jang 정실장) Narrow-mouth Frog Brother (Mangkongei Hyong 맹꽁이형)
| Long-time buddy &<br />Entertainment Manager of [[Park Myeong-su]]
| While serving as a manager, Jeong Sil-jang had aspirations to be a comedian in his own right. Whenever he was given a chance to appear on-screen, he was often ridiculed by other cast members for attempting to constantly outperform others and for overacting in order to gain attention. As such, many of his parts were usually edited out of the final broadcast. To restrain his growing popularity, [[Park Myeong-su]] often teasingly ordered that his manager not appear on the show again.