I'm not sure what the laws are like in California (assuming that you are filing in state court) but I used to be in HR and from my experience on the company's side, I would say it's pretty hard to establish wrongful termination. Even for individuals in a protected class, they have to establish that the termination was because of their age, race, gender, religion, national origin, disability (there is some variance in what is considered "protected" in different states). If your direct supervisor is the same gender as you, pretty difficult to show it was your gender. If other people younger than you have been let go, especially around the same time, pretty hard to establish it was your age, etc. This actually takes pretty careful record keeping of things that are said to you and actions taken. And the company is usually pretty well versed in the potential that someone may be documenting so HR is likely monitoring that every thing is done by the book. If you are trying to establish that you had a contractual promise for employment, you'll need a lot of documentation, dates and times. I will say that we settled a couple FMLA cases where what they were looking for was pretty small in comparison to legal costs (like a couple thousand) but other than that, the company never lost. Don't mean to sound discouraging because I know personally what it's like to be treated unfairly at work and how traumatic and painful it can be, but really the laws aren't very protective for employees beyond very basic rights to not be discriminated against.