Incredivle - Oppa Car feat. Tablo
Seo Chul-goo/Xitsuh - Freestyle (I think the others only gave him the words "Oppa Car" as inspiration.)
source: MBCkpop 1, 2, 3
This is already a bit older, but I didn't want to keep it from you guys. I think the theme of the episode was something like "most memorable eliminations of SMTM4". The atmosphere seems to have been very fun; I love hearing the others in the background of these performances. Also, I don't understand a lot of what he says, but even I realise that Seo Chul-goo is incredible at freestyling.