According to Wikipedia - List of Gurren Lagann episodes, episode 6 has 2 versions:
The normal version which is first aired on May 6, 2007 in Japan, titled
"Sit in the Hot Tub 'Till You're Sick!!" (てめえら全員湯あたりしやがれ!!)
The director's cut version, which is released on DVD, having a different title
"There are Some Things I Just Have to See!!" (見てえものは見てえんだ!!)
What are the differences between the 2 versions?