These two Season 4 episodes "Strange Trout from Outer Space" and "Cheese Orbs" were chapter four in the Cartoon Network Invaded event, which originally aired on May 25, 2007.
This event involved special episodes from The Grim Adventures of Billy & Mandy, Ed, Edd n Eddy, My Gym Partner's a Monkey, Foster's Home for Imaginary Friends, and Camp Lazlo.
Note: Episodes 7 to 9 of this season have a copyright date of 2005, which could likely be a mistake, as most of production took place that year.
[11] Note: According to an old journal entry by series creator Joe Murray, this entire season was completed by November 2007.
[12] These shorts were featured on television and on the podcasts, and were created without the involvement of the creator, Joe Murray.