The main purpose of this paper is to introduce and investigate a new class of generalized Apostolx2013;Bernoulli polynomials based on a definition given by Natalini and Bernardini (2003) [22] for the generalized Bernoulli polynomials. We obtain a generalization of the Srivastavax2013;Pintér addition theorem (Srivastava and Pintér (2004) [23]). We also give a list of expressions involving special functions that could be used to obtain some analogues of the Srivastavax2013;Pintér addition theorem. Finally, we give an analogue featuring the new class of generalized Apostolx2013;Bernoulli polynomials.