Since CPLR 306-b (a) is self-executing, the order of August 28, 1995, which dismissed Plaintiff's action against the individual defendants for failure to timely file proof of service, was superfluous ( see, Matter of Barsalow v City of Troy, 208 AD2d 1144, 1146). The action had been automatically dismissed already on February 21, 1995, 120 days after the summons and complaint were filed, at which time the 120-day period in CPLR 306-b (b) for commencing a new action began to run. Since that new action was not commenced until October 1995, it too was untimely, and was properly deemed already dismissed automatically in the order of June 12, 1996 ( see, supra; Long v Quinn, 234 AD2d 522).