Gurren Lagann
Sit in the Hot Tub 'Til You're Sick!! (1x6)
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After leaving the underground with their new brigade members, Rossiu, Gimmy and Darry, they get back on track to find the return point programmed into the Gurren. They soon find that the enemy return point is mobile.
They find themselves in a weird fog and wind up at a hotspring, but there is something fishy about this particular hot spring...
This is also a recap episode.