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With its “Weekly Casting Roundup,” CliqueClack brings you a summary of the TV casting news released throughout the week, be it the addition of a series regular, a new recurring cast member, a guest star, or even someone making a cameo.

Be warned, the casting news after the jump may contain slight spoilers about the roles the actors will play.

This week, we have casting news for the following TV series: ‘Til Death, Brothers & Sisters, Chuck, Entourage, Heroes, How I Met Your Mother, In Treatment, Supernatural, The New Adventures of Old Christine and Ugly Betty.

• Nathan Lane will guest star on FOX’s ‘Til Death as Brad Garrett’s gay brother. The episode will air during November Sweeps. [Source: The Ausiello Files]
• John Glover, who graced our screens in the past years as evil Lionel Luthor on The CW’s Smallville, will guest star in at least three episodes of Brothers & Sisters. The actor will play a love interest for Saul. [Source: The Ausiello Files]
• In other Brothers & Sisters news, relatively unknown actor Luke Grimes has been cast as Ryan. [Source: The Ausiello Files]
• Lost’s Dominic Monaghan will appear on NBC’s Chuck as a free-spirited British rock star targeted for death by a shadowy group of evildoers. [Source: The Ausiello Files]
• Gary Cole, who appeared as Katherine’s ex on Desperate Housewives last year, will be a show regular when Entourage returns next season. The actor will play a Hollywood agent. [Source: The Hollywood Reporter]
• Aliens in America’s Dan Byrd has been cast in the recurring role of a dark and twisted kid named David on Heroes. [Source: The Ausiello Files]
• Zeljko Ivanek will join Heroes as “The Hunter,” a baddie who is said to have powers. [Source: TV Guide]
• The Sopranos‘ Jamie-Lynn Sigler will guest star as Jillian, an old friend of Lily’s and a notorious party girl, on CBS’s How I Met Your Mother. [Source: The Ausiello Files]
• Hope Davis and John Mahoney will appear in the upcoming season of In Treatment. [Source: The Hollywood Reporter]
• Mark Rolston has been cast in the recurring role of Alastair, a demon hell-bent on terrorizing the brothers on Supernatural. He’ll first appear in the November 13 episode. [Source: The Ausiello Files]
• British actress Brenda Blethyn will play Christine’s mother in an upcoming episode of The New Adventures of Old Christine. [Source: TV Guide]
• Lindsay Lohan’s stint on Ugly Betty was cut short and the actress/singer will appear in less episodes than were first planned. [Source: Watch with Kristin]

If you want to learn more about the actors and their roles, click on the source links at the end of each entry.

Tags: 'til death, Brothers and Sisters, casting, chuck, entourage, heroes, how i met your mother, In Treatment, supernatural, The New Adventures of Old Christine, Ugly Betty