Silkie has appeared in the background in three episodes in this season: X (2004), Betrothed (2004) and Haunted (2004).
Starfire tries to feed Silkie mustard. Mustard is Starfire's favorite food as revealed in The Sum of His Parts (2003).
Thomas Haden Church provided the voice of Killer Moth in Date with Destiny (2004), but he was not available for this episode and the role was assumed by Marc Worden.