The Giants and Patriots go at it again on Sunday.

It doesn't happen often (every four years), but when they meet, something special seems to unfold when it's New England's Bill Belichick and Tom Brady against the Giants' Tom Coughlin and Eli Manning.

Link: Click this link to watch Patriots vs Giants match online here

Again the Patriots come in undefeated. The Giants are the heavy underdogs. Seen this one before?  Nobody really believes in this Giants team, in part because they bring along the league's worst defense and 31^st-ranked pass defense. That doesn't seem to bode well against the Patriots and Brady.

New England averages an NFL-best 34.5 points per game and has the second-ranked offense. They're running through the league.  

Chris Snee Unguarded: Who expect from the Giants vs Patriots matchup Former New York Giants offensive guard Chris Snee sits down with NJ Advance Media's Jordan Raanan to talk about Giants upcoming game agains Tom Brady and the undefeated Patriots. (Video by Amanda Marzullo | NJ Advance Media for NJ.com)

But when these two franchises meet, strange things seem to happen. It makes Sunday's matchup a must-watch. So don't miss it. 

Here's everything you need to know: 

Who: Patriots (8-0) at Giants (5-4) 

What: Giants trying to ruin New England's undefeated season ... again