How I Met Your Mother season 9 episode 21 is airing tonight, which means the finale for the hit, long-running series is just around the corner. But before we bid the show a bittersweet goodbye, someone from the past is paying a visit, and let's just hope our gang of five is going to enjoy his company, especially the groom, who seem to be pretty anxious about the sudden reappearance of this person. Sounds interesting, eh? Watch How I Met Your Mother season 9 episode 21 stream using the free online stream link below.

Note: The following paragraphs contain major spoilers, if you don't want to spoil the fun and excitement of the brand new episode, simply scroll down to the bottom and look for the free online stream link there.

Well, we know that the big wedding is just hours away, but this does not necessarily mean that a guest star won't be crashing to bring joy (and bad memories) to our characters. And yes! Gary Blauman (Taran Killam) is back and somehow some of our characters are not pleased to hear the news. Although Gary is one of Barney Stintson's co-workers and ultimate bro, the groom also shares the same pain everyone is experiencing by just simply recalling their personal encounters and experiences with Blauman. Nevertheless, the episode will surely be very interesting since in real-life, Killam is Cobie Smulder's hubby. So technically speaking, he will be there when his wife walks the aisle in the series. Catch the all-new episode this Monday night at 8/7c on CBS. Watch How I Met Your Mother season 9 episode 21 stream through the free online stream link found at the bottom.

There are only two episodes left before the two-part finale of the show, and everyone is very much excited over the much-anticipated finale for Ted and the Mother. Speaking of the mother, Christin Milioti is also making an appearance tonight alongside William Zabka. Additionally, we can't deny that ever since the final season began airing, many have been orchestrating theories on how the show ends. There is even a speculation that the mother is apparently dead all along and that the show creators were hinting her funeral when they said that the finale is going to be sad. But then again, everything is left vague until the final episode airs. Watch How I Met Your Mother season 9 episode 21 via online access using the free online stream link at the end of this post.

Meanwhile, an episode clip for the upcoming How I Met Your Mother season 9 episode 21 has leaked online recently, and it has revealed that apart from the present-day storyline, there will still be some major scenes in the future. Show fans will now find out where Ted took the mother in their first date. The leaked clip hints that Ted would suggest to the mother to try out "Scottish, Mexican fusion" but our quirky mother isn't that happy just hearing the words "Scottish" and "Mexican" in the same menu. Additionally, more revelations are about to come our way as International Business Times reported that Robin and Gary Blauman may have had a fling in the past. This is of course implied in the sneak peek wherein Robin is seen freaking out when Gary arrives. Don't miss the all-new episode. Watch How I Met Your Mother season 9 episode 21 stream by clicking on the free online stream link below.

The official synopsis for How I Met Your Mother season 9 episode 21 reads: "When Gary Blauman shows up at the wedding, it sends the gang into a frenzy as they each recall an encounter with him."

"Gary Blauman" is set to air this Monday, March 17, at 8/7c on CBS. Watch How I Met Your Mother season 9 episode 21 stream using this free online stream link here.