Bala introduced Rajendran in a small role in the film Pithamagan. Later on he donned the villain role in the film Naan Kadavul directed by Bala. From that time he has been called as Naan Kadavul Rajendran. Later on he donned an important role in the film Boss Engira Bhaskaran.
Since his role was much spoken about he was flooded with offers. Even in the recently released film Thirudan Police, he had donned a villain role which was very comical.
Rajendaran who has been donning different kinds of roles has a problem to speak lengthy dialogues. It is understood that he is not able to even speak two line dialogues.
In order to sort out these problems, an assistant director will there to teach him the dialogues. The other problem is Rajendran does not know to write and read. Because of his acting talents, the directors ignore this problem.