Tex. Labor Code § 62.203: PLAINTIFFS.

(a) An action to recover a liability under this subchapter may be brought by an employee for that employee and other similarly affected employees.

(b) An employee may not be a plaintiff to an action brought under this subchapter unless:

(1) the employee consents in writing; and

(2) the consent is filed in the court in which the action is brought.

Acts 1993, 73rd Leg., ch. 269, Sec. 1, eff. Sept. 1, 1993.