Looking for the name of a specific time travel anime?

I watched this probably about ten or so years ago and really want to find it again.

This is what I can remember of the anime:

The main theme was time travel,

The main characters were a boy, a girl and a professor,

The professor's lab might have been made of glass with a lot of plants in it,

Lots of mushroom cloud explosions( possibly at least one in each episode I've seen,)

Cavemen( possibly dinosaurs,)

The main villainess was blond wearing a black swimming costume with a diamond shaped hole for her belly button( or it might have been a very low neckline,)

it was in English,

there was a time machine,

It was probably aimed for quite a young audience( say pokemon age group)

' Time' might have been in the name.

Any help would be greatly appreciated, thank you. :)