Darius Henderson hit a hat-trick as Millwall cruised past Dagenham & Redbridge to book an FA Cup fourth-round tie with Southampton.
Henderson opened the scoring at the New Den when he fired in after Harry Kane's shot fell to him before Kane doubled the Lions' lead from 20 yards.
Henderson tapped in the third from Liam Trotter's pass before adding his third from the penalty spot.
On-loan Tottenham youngster Kane then added his second goal with a header.
Millwall, thumped 6-0 by Birmingham City at the weekend, made a shaky start as Dominic Green almost capitalised on an errant backpass.
But Henderson calmed any nerves with Millwall's opener.
Kane's 30-yard shot was tame but fell fortuitously at Henderson's feet and the former Watford man was able to curl into the top corner from 10 yards.
Kane then lashed a long-range shot right through Daggers keeper Chris Lewington to make it 2-0 before the League Two side hit the crossbar from Billy Bingham's swirling cross-shot.
The visitors enjoyed a strong 10-minute spell after the break but their sprit was crushed by a three-goal burst in six minutes for Millwall.
First Henderson was on hand to complete a sweeping move which ended in him sliding home a Liam Trotter pass, and he then struck from the spot after Kane was fouled by Oluwafemi Ilesanmi to bring up his second treble of the season.
Kane - who was superb throughout - completed the rout when he headed in a cross from the left from close range.
The Tottenham youngster, who was not born when Spurs last won the FA Cup in 1991, was at the heart of everything and could yet prove a useful asset for Harry Redknapp.
The Lions will now host Championship leaders Southampton on 28 January in the last 32 of the FA Cup.
Millwall assistant Joe Gallen:
"We've been saying we needed a win and to do that we needed some goals, so to score five was a good confidence boost, especially for the forwards.
"All round it's been a good evening for us, but now we've got to do it in the league.
"We'll see in the next few weeks whether these two guys can score the goals we need."
Dagenham boss John Still:
"I thought the scoreline was a bit harsh.
"We were hoping to get to half-time maybe a just a goal down. But we have our three main strikers out injured so we didn't have a focal point for our attack."