There is no cape or costume to get. You beat Betty Jetty by getting super flying power, and the only way to get it is by beating the other 5 super-villains. Once you have returned the last of the five to prison, the phone will ring on Main Street. Answer it to receive your super flying power (icon at lower left).
Fly up to the top of the skyscraper and chase Betty Jetty. After dodging her attacks for a couple of minutes, you can get close enough to knock her down, and Ned Noodlehead finishes her off.
(To get the Island Medallion, get a hot dog and Ned will trade it to you.)
Betty Jetty's not on TimeTangked Island she's on Super Power Island
You Have to defeat all the villains on super power island except Jetty Betty.
At the end of Super Power Island, you go to the phone booth. (click on it) Then, you will get flight!!!!!!!!! You have to defeat Betty Jetty!!!!!!!!!
A person can defeat Betty Jetty on Super Power Island by avoiding the lasers she shoots. This makes her mad and allows the comic book shop owner time to defeat her.
Defeat the other 5 super villains (all but Betty Jetty). When you walk past the telephone booth, it will ring. Answer the phone and you will be given the power to fly. Now you can go after Betty Jetty, on the skyscraper Downtown.
you get the phone ringing when you defeat 5 villains and that is how you get the flying ability to catch Betty Jetty.
The hero who defeats Betty Jetty will receive the Island Medallion! (hmm...see the related question)
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)
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.
There are no weapons on the island. Betty Jetty can throw energy balls at you.
First you defeat all the bad guys in super power island but not betty jetty then you will recive a phone call in the phone booth then you can fly.
Although you defeat Betty Jetty, the Island Medallion goes to Ned Noodlehead by mistake. Take a hot dog to him at his comic book store.