OVERMAN King Gainer eyecatch! キングゲイナー アイキャッチ

[GreenGearMood]

WTF.

[Bonehimer]

Would it be even more expansive to animate the mecha in clay animation?

[BrakusJS]

Kinda long for an eyecatch, but very cute. Of course, you gotta hand it to a show that has the entire cast doing the monkey in the middle of the OP sequence. :)