On-loan West Ham midfielder Junior Stanislaus marked his debut with two goals as Southend overcame Luton to clinch a third round FA Cup berth.
Stanislaus, who joined on Thursday, cracked home Southend's opener from 25 yards, only for Michael Spillane to head Luton level.
The 19-year-old headed Southend back in front from Kevin Betsy's cross.
Southend wrapped up victory when Anthony Grant set up fellow substitute James Walker to smash home.
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Goals: Stanislas 34, 84, Walker 90.
Luton:
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Booked: Roper, Andrews, Watson.
Goals: Spillane 80.
Att: 4,111
Referee: Andy Penn (W Midlands).
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