Ballet Birdmen, City in the Sky, and the Swimsuit Episode
Wow, it's been THAT long in-between episode postings? Oops. Either way, the quartet became a trio at the beginning before shifting into just a duo midway through the discussion of the quota. In this episode, Trigun's Humanoid Typhoon is now an act of God, Tutu approaches its endgame, and Gurren uses the OTHER stereotypical fanservice episode because having one wasn't good enough.
The opening theme is "Sorairo Days" (Tengen Toppa Gurren Lagann OP) by Shoko Nakagawa. The ending theme is "Watashi No Ai Wa Chiisaikeredo" (Princess Tutu ED) by Ritsuko Okazaki.
For more info about this episode, go here: http://goo.gl/G8vzl