I do a lot of miniature gaming, and those are often bent out of shape. Depending on the type of plastic/resin used, I'd try boiling water first.
Boil some water, pour in a cup, hold the plastic part in it for a couple of minutes, if it bends back on its own, you're good. If it doesn't, that means it's been made this way. Even if you bend it back, then in time it'll bend back out again, because the plastic has some sort of shape-memory. Which is exactly the reason why bent plastic bends back into the right shape when dipped in hot water, if it was manufactures correctly.
If that fails, then try thr hair dryer (although that may not be hot enough). Water is safer.
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