A Saturday night outing left four young Northern Virginians dead and three others seriously injured in a violent two-car crash early yesterday morning on Annandale Road in Fairfax County.

The 2 a.m. collision, which propelled both vehicles down a 12-foot embankment on a curve near Gallows Road, involved one car of teen-agers and another of three close friends, all believed to have been returning home from separate Saturday night parties.

Fairfax County police identified the dead as Deborah Rogers, 17, of the 8100 block of Heatherton Lane in Vienna; Wallace Simpson Jr., 18, of the 3200 block of Blundell Road near Falls Church; Lawrence O'Brien, 22, of the 900 block of Ware Street in Vienna, and Cathy Storey, 22, of the 9700 block of St. Andrews Drive in Fairfax.

Listed in "extremely critical" condition at Arlington Hospital yesterday was Michael Bacon, 21, of Fairfax. Alana Klingebiel, 18, of Falls Church was in serious condition and Jonathan P. Reinemer, 19, of Falls Church was in stable condition, both at Fairfax Hospital.

Police said the northbound car carrying the four teen-agers, with Reinemer at the wheel, went out of control on the curve. It skidded sideways into the opposite lane, where it struck a car driven by O'Brien.

Both compact cars tumbled off the road, rolling over several times before landing upright.

Police said they are still investigating the accident.

O'Brien, who worked at a furniture store in Mayfield, and Storey were planning to be married, relatives said. Bacon, who was in the car with them, was a long-time friend of O'Brien's.

Relatives said the three had planned a party in Georgetown Saturday night.

Apparently, O'Brien was taking Bacon to his home south of Fairfax City when the accident occured.

Relatives who could be reached yesterday said they did not know why Rogers, Simpson, Klingebiel and Reinemer were together, or where they were going.