You have to beat all 5 of the other villains to get to Betty Jetty because once you defeat all the other villains you get your powers and you can fly.
(see related question)
Betty Jetty's not on TimeTangked Island she's on Super Power Island
Copycat, Speeding Spike, Sir Rebal, Ratman, Crusher, and Betty Jetty
The hero who defeats Betty Jetty will receive the Island Medallion! (hmm...see the related question)
As you defeat each villain and handcuff them, you return to the prison, then go right to the city again. When you have defeat all 5 of the super villains (everyone but Betty Jetty) the pay phone will ring on Main Street and you will receive your super flying power. Then you can go to the skyscraper Downtown and fly up to chase betty Jetty.
The pay phone will ring when you have defeated the first 5 super villains (Copycat, Speeding Spike, Sir Rebral, Ratman, and Crusher). Answer the phone and you get the power to fly! Then you can defeat Betty Jetty.
There are no weapons on the island. Betty Jetty can throw energy balls at you.
There is no jet pack. Cature the 5 super villains (Copycat, Speeding Spike, Sir Rebral, Ratman, and Crusher) and you will receive the flying power that you need to chase the 6th villain, Betty Jetty.
The pay phone will ring when you have defeated the first 5 super villains (Copycat, Speeding Spike, Sir Rebral, Ratman, and Crusher). Answer the phone and you get the power to fly! Then you can defeat Betty Jetty at the skyscraper (Downtown).
There are 6 escaped villains to recapture. The first 5 are Copycat, Speeding Spike, Sir Rebral, Ratman, and Crusher. Once you have captured them, you receive your super flying power to chase the 6th, Betty Jetty.
She can be found either the Super Power Island or Reality TV island (sometimes)
There is no jetpack on Super Power Island, as there is on Early Poptropica. The ability to fly is an actual "super power" on the island, and is only acquired by defeating the first five super villains (Copycat, Speeding Spike, Sir Rebral, Ratman, and Crusher), using your wits only. The pay phone will then ring and give you flying power, which you need to catch Betty Jetty. (Super Flying Power works only on this island, but comes in handy on the various ad games, when they are accessed from Super Power Island.)
You Have to defeat all the villains on super power island except Jetty Betty.