What are some Bad plot twist that annoy you?

[Kantor]

Riachu said:

Kantor said:

I hate it when somebody is your ally for half the game, and then it turns out that they're EVIL just as you're starting to like them.

Examples:

Harry Flynn

Alister Azimuth (kind of)

The latter was not evil.  His motives just got the best of him and was already too late when he realized it.

You still had to fight him, though. If I were Ratchet, I would have gone along with it.