One of my favourite tropes is a time traveler going back in time to stop some great disaster but they end up making things worse.
Wasn’t that the whole plot of Time Squad?
No, in time squad, they made things right sort of. Things didn’t get worse. It IS however the plot of the android saga when future trunks somehow causes EIGHT ANDROIDS AND CELL instead of just two to run around the world (though cell is debatable)