'Arrow' Season 3 Finale Features The Flash, Stephen Amell Tweets ‘Series Finale’ As Show Boss Denies ‘Legends’ Backdoor Pilot (Spoilers, Video)

Cast Members Stephen Amell, Right, And Katie Cassidy Attend A Panel For 'Arrow.' — Cast members Stephen Amell (R) and Katie Cassidy attend a panel for "Arrow" during the CW television portion of the Television Critics Association summer press tour in Beverly Hills, California July 30, 2012. Reuters

“Arrow” Season 3 finale features Barry Allen aka The Flash (Grant Gustin). Barry has Nanda Parbat scenes in the promo video. Meanwhile, Oliver Queen actor Stephen Amell joked about a “series finale” on Twitter, as show boss Marc Guggenheim denied there would be a reference to the “Legends of Tomorrow” spin-off.

Spoiler alert: This update contains “Arrow” Season 3 finale spoilers. Read on at your own risk.

Comicbook.com reported the “Arrow” Season 3 finale is extended by more than two and a half minutes. The website considered “DC’s Legends of Tomorrow” may have something to do with the extra time, but Guggenheim denied it.

On Twitter, Stephen Amell announced to his followers that he has just watched the “Arrow” Season 3 finale. He did so by joking about watching his show’s “series finale.” (See his tweet below.) This tweet echoed what show boss Marc Guggenheim told Entertainment Weekly recently: that the third season finale “really feels like the end.”

“The Season 3 finale of Arrow is very definitive. It really feels like the end, not just of season 3, but of the first three seasons,” Guggenheim said. In the same EW interview, Guggenheim said Arrow 3x23 “doesn’t relate” to the show’s spin-off series on The CW, “DC’s Legends of Tomorrow.”

Incidentally, The CW has officially picked up “DC’s Legends of Tomorrow” for the 2015-2016 television season. It stars (from “Arrow”) Ray Palmer a.k.a. Atom (Brandon Routh) and (from “The Flash”) Leonard Snart a.k.a. Captain Cold (Wentworth Miller), among others. Caity Lotz also stars in a mystery role.

The “Arrow” Season 3 finale is titled, “My Name Is Oliver Queen.” Oliver drops this line before Ra’s al Ghul (Matt Nable) in the promo video. In the same clip, Barry Allen tells Team Arrow to trust Oliver. John Barrowman’s Malcolm Merlyn appears to be protecting the team, as well.

VIDEO: 'Arrow' Season 3 Finale Promo Video | The CW On YouTube

“Arrow” Season 3 finale also stars Rila Fukushima as Tatsu and Katrina Law as Nyssa al Ghul. It was written by series developers Greg Berlanti, Marc Guggenheim and Andrew Kreisberg together with “Arrow” supervising producer Jake Coburn. John Behring directed the special episode.