Billericay battled back to hold Leatherhead to a 1-1 draw, forcing an FA Cup first-round replay between the seventh-tier sides.
Jack Midson, a scorer in every round of this season's competition, nodded an opener for Leatherhead but his strike was cancelled out by Billy Bricknell at Fetcham Grove.
The Tanners are in the second round hat for the first time in 11 years, while Billericay, who have spent big this season on the likes of Paul Koncheskey, Jamie O'Hara and Jermaine Pennant, are bidding for their first ever appearance at that stage.
Against the run of play, Midson headed home at the near post in the 21st minute.
He was found by a clipped cross from player-manager Sammy Moore, who was part of the AFC Wimbledon side that gave Liverpool a third-round fright in 2015.
Former Liverpool star Pennant, an FA Cup finalist with Stoke, came off the bench and Town equalised through Bricknell's 68th-minute penalty after Sam Blackman tripped Ricky Modeste.
Leatherhead clung on for a replay, with Zaki Oualah saving well from Rob Swaine's downward header.
English FA Cup News
Will Harry Maguire sign with Tottenham or West Ham?
James Olley breaks down the Harry Maguire pursuit between Tottenham and West Ham, and wonders if he would fight to stay in Manchester United or start fresh.
'One game away!' - Guardiola fuels Man City's historic treble
Pep Guardiola believes Manchester City need to win the Champions League to be recognised among the greats.
Ogden: No surprise Pulisic on way out of Chelsea
Mark Ogden gives the latest on Christian Pulisic's future after Juventus emerge as front-runners to sign the USMNT forward from Chelsea.
Fan charged for wearing offensive jersey to FA Cup final referring to Hillsborough tragedy
London's Metropolitan Police said on Sunday that a man was charged with wearing an offensive jersey to the FA Cup final that referenced the 1989 Hillsborough Stadium disaster.
Fan arrested at FA Cup final for wearing shirt with apparent reference to Hillsborough disaster
A fan was arrested at the FA Cup final between Manchester United and Manchester City for wearing a shit with an apparent reference to the Hillsborough disaster.
Man City boss Pep Guardiola hopeful FA Cup final hero Ilkay Gundogan will stay
Pep Guardiola says he remains hopeful Ilkay Gundogan will extend his stay at Manchester City after his man-of-the match performance in the FA Cup final.