|Prime of Invincibility!|
|Rōmaji||Muteki no Puraimu!|
|Air Date||August 6, 2014|
|Animation Director||Miku Kadowaki|
|Opening||Dried Up Youthful Fame|
|← Episode 17||Episode 19 →|
Prime of Invincibility! (無敵のプライム！ Muteki no Puraimu!) is the sixth episode of season two of the Free! anime and the eighteenth episode of the overall series. It aired on August 6, 2014.
Nagisa Hazuki, Makoto, Momotaro Mikoshiba, Rei Ryugazaki, and Rin all qualify in their respective individual events. Later, Makoto competes against Haru in the 200m freestyle, wanting to have a real race against him before they graduate. Despite losing due to his lack of pacing, Makoto is overjoyed to have a serious race with Haru.
Haru and Rin then face off against each other in the 100m freestyle, with Haruka narrowly beating Rin by 0.02 second, bringing the first day's events to a close.
List of characters in order of appearance:
- Prior to Eternal Summer's English DVD release by Funimation the episode was called 'Invincible Prime!' in English