Ernesto is an employee at Hamlin, Hamlin & McGill.
Ernesto is put in charge of bringing supplies to Chuck. When he doesn't bring the right items, Chuck tells Ernesto to get it right next time. Ernesto leaves the house and to his surprise, Jimmy is outside. The two exchange hellos, and Ernesto drives off. ("Marco")
Ernesto drives Chuck to HHM. ("Cobbler")
Ernesto drives Chuck to HHM and carries his files up to his office. ("Rebecca")
Ernesto calls Jimmy and tells him that his brother is not doing well, and is insisting on Ernesto not calling a doctor for him. Jimmy tells Ernesto to make him chicken broth and to wrap him in multiple space blankets. Jimmy also insists on not calling a doctor. ("Fifi")
Ernesto goes to the copy shop to ask the clerk if Jimmy was in his store. The clerk confirms that Jimmy was in the store. Ernesto leaves and tells Chuck about his findings. Chuck returns to the store with Ernesto to confront the clerk. Having been paid off by Jimmy, the clerk denies ever seeing Jimmy, making Chuck irate. Ernesto attempts to get Chuck to calm down, but Chuck eventually gets overwhelmed by the electricity and hits his head on the counter. ("Nailed")
Ernesto helps Chuck after he takes his fall. After being put in stable condition, Jimmy and Ernesto go in to check on Chuck, with Chuck accusing Jimmy of bribing the copy store clerk after learning that Jimmy was there moments after he fell, but Ernesto clears him, claiming that he called Jimmy before they went to the store. Outside, Jimmy asks why Ernesto lied on his behalf, to which he answers that Chuck's increasingly vindictive nature was beginning to alarm him, and he didn't want to see his friend get in trouble. ("Klick")