Here's how Muska returns in Return to Paradise Falls
[we now veiw another airship flying above and then inside we see Muska!]
Muska: [looking around]
General Deceptitrain: What is your command, my league?
Muska: [as Saruman] We have work to do.
General Deceptitrain: Yes sir.
Muska: Soon, she will be under my grasp once more and so will the bird of Paradise Falls! [hears Spongebob's singing] Ah-ha! They're down there! Send some of the troops out!
Spongebob: Paradise falls, Paradise falls, for you and me! [rapping] Paradise Falls... [drum sounds] Paradise Falls... [later, SpongeBob is walking backwards. SpongeBobs pants almost split into two and move up and down silmutaneously while he continues to make drum sounds. Still later] Paradise FAAAAAAAALLLLLLLSSSSS is the place, yeah, for you and, MEEEEEEEEEEEEEEEEEEEE......
Peter: [puts a cork in his mouth] Ah! Piece and quiet!
SpongeBob: [spits it out]
Brian: Let's take a break.
Vinny: Good idea.
[Kipper and his friends ties the ropes to the bench on a tree]
Skyla: [walks to the bushes]