Only real complaint I had with Adventure 02 was that T.K. and Kari were treated like pawns.
season 2 tk is an awful, awful character. when i was rewatching this season 4 years ago or so (i got about 30 episodes in) i realized how terrible he was written. kari isn't really much better, either - it seems to me that the biggest problem was that they bothered to include those two characters again for no real reason in another season.
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it's an underwater adventure ride