NBC.com released the description of “Heroes” episode 21: “The Hard Part”, episode 22: “Landslide” and season’s finale episode 23: “How To Stop An Exploding Man”

SPOILERS ahead!

Episode 1.21 “The Hard Part”

Air Date: May 7, 2007

Show Cast: Milo Ventimiglia, Ali Larter, Hayden Panettiere, Greg Grunberg, Sendhil Ramamurthy, Masi Oka, Santiago Cabrera, Leonard Roberts, Adrian Pasdar, Tawny Cypress, Noah Gray-Cabey, Omid Abtahi, Cristine Rose, Ashley Crow, Randall Bentley, Jack Coleman, Thomas

AS NATHAN AND HIS FAMILY READY FOR THE ELECTION, HIRO AND ANDO FACE THE HARD PART OF SAVING THE WORLD; ERIC ROBERTS, RENA SOFER GUEST-STAR — Now knowing what’s at stake if they fail in their mission, Hiro (Golden Globe nominee Masi Oka) and Ando’s (James Kyson Lee) determination to save the world is put to the test. Committed to the path, Nathan (Adrian Pasdar) takes some surprising steps to guarantee his election. Jessica (Ali Larter) and D.L. (Leonard Roberts) begin to learn how their family fits into Linderman’s plans. Thompson (guest star Eric Roberts, “Less Than Perfect”) brings someone new into his company’s fold. With more and more blood on his hands, Sylar (guest star Zachary Quinto) visits his mom (guest star Ellen Greene). Santiago Cabrera, Jack Coleman, Noah Gray-Cabey, Greg Grunberg, Hayden Panettiere, Sendhil Ramamurthy and Milo Ventimiglia also star. Matthew John Armstrong, Justin Evans, Missy Peregrym, Cristine Rose, Rena Sofer (”24″), Adair Tishler, and Jackson Wurth guest-star.

Episode 1.22 “Landslide”

Air Date: May 14, 2007

Show Cast: Milo Ventimiglia, Ali Larter, Hayden Panettiere, Greg Grunberg, Sendhil Ramamurthy, Masi Oka, Santiago Cabrera, Leonard Roberts, Adrian Pasdar, Tawny Cypress, Noah Gray-Cabey, Omid Abtahi, Cristine Rose, Ashley Crow, Randall Bentley, Jack Coleman, Thomas

AS LINDERMAN ARRIVES, NATHAN CONSIDERS THE COST TO WIN THE ELECTION; MALCOLM MCDOWELL, ERIC ROBERTS AND GEORGE TAKEI GUEST-STAR — Poised to become a member of Congress and maybe more, Nathan (Adrian Pasdar) considers the cost to those he loves, along with his mother’s (guest star Cristine Rose) advice and Linderman’s (guest star Malcolm McDowell, “Entourage,”"A Clockwork Orange”) prophecy. As he prepares to face Sylar (guest star Zachary Quinto) to the death, Hiro (Golden Globe nominee Masi Oka) learns of his lineage from his father (guest star George Takei, “Star Trek”). While various “heroes” fatefully arrive in New York City, Peter (Milo Ventimiglia) and Ted (Matthew John Armstrong) attempt to leave the city before the foretold explosion. H.R.G. (Jack Coleman) and Matt (Greg Grunberg) learn the surprising truth behind the tracking system used on people with special abilities. Santiago Cabrera, Noah Gray-Cabey, Ali Larter, Hayden Panettiere, Sendhil Ramamurthy and Leonard Roberts also star. Clea DuVall, Justin Evans, James Kyson Lee, Missy Peregrym, Eric Roberts, Rena Sofer, Adair Tishler and Jackson Wurth guest-star.

Episode 1.23 “How To Stop An Exploding Man” (season finale)

Air Date: May 21, 2007

Show Cast: Milo Ventimiglia, Ali Larter, Hayden Panettiere, Greg Grunberg, Sendhil Ramamurthy, Masi Oka, Santiago Cabrera, Leonard Roberts, Adrian Pasdar, Tawny Cypress, Noah Gray-Cabey, Omid Abtahi, Cristine Rose, Ashley Crow, Randall Bentley, Jack Coleman, Thomas

HEROES RISE AND FALL IN THE SHOCKING SEASON FINALE WRITTEN BY EXECUTIVE PRODUCER/CREATOR TIM KRING AND DIRECTED BY EXECUTIVE PRODUCER ALLAN ARKUSH — With Isaac’s (Santiago Cabrera) horrible predictions all unfolding before them, the everyday people with extraordinary abilities face moments of pain and peril in Kirby Plaza with unflinching heroism, as “Heroes” first volume comes to a close — and the next surprisingly begins. Jack Coleman, Tawny Cypress, Noah Gray-Cabey, Greg Grunberg, Ali Larter, Masi Oka, Hayden Panettiere, Adrian Pasdar, Sendhil Ramamurthy, Leonard Roberts and Milo Ventimiglia also star. Clea DuVall, Lisa Lackey, James Kyson Lee, Missy Peregrym, Zachary Quinto, Richard Roundtree, George Takei and Adair Tishler guest-star.