Fallon will host the episode and Timberlake will serve as musical guest, while Paul Rudd and John Goodman are tapped as the hosts for other episodes next month.
Jimmy Fallon and Justin Timberlake will help "Saturday Night Live" wrap up December. The comedian is set to return as the host for the second time on December 21, during which his frequent "Late Night with Jimmy Fallon" guest will serve as musical guest.
Fallon, who was a former "SNL" regular, has hosted the NBC variety show once before in 2011. Timberlake himself has hosted the show five times, but this will mark his fifth appearance as musical guest.
Also scheduled to take over Studio 8H this coming month are Paul Rudd and John Goodman. Rudd will host the show for the third time on December 7, less than two weeks before his new movie "Anchorman: The Legend Continues" opens in U.S. theaters. One Direction will return as musical guest for the second time in the episode.
As for "Alpha House" star Goodman who has hosted the show 12 times before, he will be back as host on December 14 with Kings of Leon as musical guest. The Grammy-winning rock band has performed on the sketch show twice before.