"Rank & Stinky Go to Hollywood" - Wren and Stoopy (parodies of Ren & Stimpy) are a huge success, but their salary demands are too high, so the studio finds Rank & Stinky as replacements.
"Rank & Stinky Meet the Simplesons" - Barf Simpleson (aka Bart Simpson) adopts Rank & Stinky and brings them home.