Two warriors are sent back in time. One to change history, one to ensure it takes its established course. Or, at least, to prevent the first one from changing things. A game of cat and mouse ensues.
Can also be thought of as Evil Counterpart IN TIME! If it does not overlap with Set Right What Once Went Wrong, it will instead overlap with Make Wrong What Once Went Right: In this case, the [...] [tvtropes.org]