[VoidinToku]

It makes more sense that he's cobra since he wanted him to be build and cobra tested him twice this episode. Bat might be the mustache guy that looks like kamen rider ketaros. Since they pops up randomly, it wouldn't be too far fetched that he transform and catch up to build at the end of the first episode. Btw The pandora box reminds me of the motherbox in the dc movies.