Michael Jackson came off the bench to grab an extra-time winner for Blackpool and send them into the fourth round of the Carling Cup at Southend's expense.

Matt Harrold gave Southend a surprise lead when he fired in a penalty after Charlie MacDonald was brought down by goalkeeper Rhys Evans.

Scott Vernon equalised for Blackpool when he converted the loose ball from Wes Hoolahan's shot.

Jackson settled the tie when he poked in from Andy Welsh's corner.

Blackpool: Evans, Coid, Barker, Gorkss, Hills (Morrell 62), Taylor-Fletcher (Jackson 84), Flynn, Fox, Parker (Hoolahan 61), Welsh, Vernon.
Subs Not Used: Southern, Doughty.

Booked: Evans, Hills, Flynn.

Goals: Hoolahan 81, Jackson 118.

Southend: Collis, Hunt, Peter Clarke, Richards, Barrett, Black (Francis 72), Maher, Bailey, McCormack, MacDonald (Foran 58), Harrold (Moussa 106).
Subs Not Used: Flahavan, Wilson.

Booked: Harrold, Black, McCormack.

Goals: Harrold 7 pen.

Att: 5,022.

Ref: Michael Jones (Cheshire).