Glee's successful run will come to an end this Friday, 20 March, at 8pm on Fox.
The special two-hour series finale of Glee is titled, 2009/Dreams Come True, where the members of New Directions take their final bows.
Click here to watch the finale episode online on Fox's website.
The official synopsis reads as follows:
"I'm satisfied. I was reading it and the last two episodes are airing back-to-back, so it's kinda this double whammy all at the end," he said.
"I think [viewers will] be happy. I was happy. They tie up a lot of great storylines and you get to see these people in a new light and follow their journey. These characters have gone through a lot and I think there's a good payoff at the end."
The actor also talked about how the show would honour Cory Monteith, who played star quarterback Finn Hudson in the series and who died unexpectedly in 2013.
"I think [Finn] is always remembered and especially at a time like this at the very end, there will definitely be some sort of mention of him," McHale revealed. "He'll be involved in some way."
He said that ultimately he and the entire cast will be "a mess" when the finale airs, especially his co-star Lea Michele, who plays Rachel.
According to Tvline, "If the buzz trickling out of McKinley is to be believed, the Glee finale will be viewed as a (mostly) satisfying conclusion to the show's six-year run."
The final shot, in particular, is pretty near perfect, said the report, adding, "The five-year time jump that comprises much of the final act will allegedly find one character pregnant, but there's a twist. Also, Rachel will have bid adieu to single life, but the identity of the man on her arm may surprise you."
Watch all the promos here: