There is no invisibility effect as part of Super Power Island. It is part of Spy Island.
(see related question)
ability to become invisible
The island after Super Power Island was Spy Island.
No, there is no "super strength" on super power island glad to help :D
The subway is Downtown on Super Power Island.
There are no cheats in super power Island.
Go as far as you can to your right in Super Power Island.
Yes, that is how I completed super power island!
you can't get speed on super power island
There are 6 villains to defeat on Super Power Island.
The force shield is not an item on Super Power Island
you cant sorry
Spy Island