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That's gonna be one jam-packed wrap party.

A bevy of big-name alumni are set to return to The West Wing for the political drama's last hurrah this spring, the network has announced.

Rob Lowe, Mary-Louise Parker, Emily Proctor, Marlee Matlin, Gary Cole, Tim Matheson, Timothy Busfield, Anna Deavere Smith and Annabeth Gish are all set to reprise their roles for at least once during the series' five remaining episodes.

The most notable returnee is Lowe, who was originally billed as the show's lead when West Wing premiered in 1999, but who left in 2003 amid a salary squabble and shrunken duties. He is back as Sam Seaborn, the former White House aide who departed the Bartlet administration to run for a congressional seat in California.

According to NBC, Seaborn will return as a "senior political official," and that the outcome of the election between Democrat Matt Santos (Jimmy Smits) and Republican Arnold Vinick (Alan Alda) will be decided prior to his return.

Parker, now starring on Showtime's Weeds, will return to her Emmy-winning role as women's rights lobbyist Amy Gardner, a former love interest of Josh Lyman (Bradley Whitford).

NBC is staying mum on specific dates for each characters' reappearance. The network would only say that each will show up at least once during the final few episodes, though not necessarily the series finale.

The West Wing's seventh and final season returns on Mar. 12 for an uninterrupted run of the final 10 episodes.

Producer John Wells has said that the Vinick-Santos election, the primary focus of the season, will be handled in shows airing Apr. 2 and 9.

Several of the returning characters are expected for a bittersweet reunion in the Apr. 16 installment. The episode will focus on the funeral of Santos' running mate and President Bartlet's former chief of staff, Leo McGarry. The episode was written following the unexpected death of show stalwart John Spencer last December during the series' winter hiatus. Spencer suffered a fatal heart attack just four days shy of his 59th birthday. (Parker, who took home the Golden Globe for Best Actress in a Comedy Series last month, dedicated her win to her former costar.)

The finale for the 25-time Emmy-winning series, taking place the day two-term president Bartlet leaves office and the new commander in chief is inaugurated, is scheduled to air May 14.