Wonder Woman

Allan Arbus

Gretchen Corbett

Frank Doubleday

Peter Kwong

Dawn Lyn

E.J. Peaker

Lynda Carter

Lyle Waggoner

What happens to the Wonder Woman robot in 'The Deadly Toys'?

Unknown, it is last seen knocked out on the Toymaker's floor. However at the end of the story we see a smiling Wonder Woman writing 'Merry Christmas' on the window of the shop. It may be the real Wonder Woman returning to finish things once and for all but it may be the robot who has recovered and is still out there somewhere.

How many different costumes does she have?

Putting aside her outfits on Paradise Island and the clothes and various disguises adopted by Diana Prince there are six different variatons on the Wonder Woman costume. Firstly the 1940s outfit we see in season 1. Then in 'The Bushwhackers' we see Wonder Woman's cowgirl outfit (reputedly because guest star Roy Rogers was uncomfortable to have Lynda Carter running around a bunch of child actors in just a 'bathing suit'). In season 2 we have the improved 1970s costume. It is a lot skimpier, lower cut in the cleavage in order to expose more of the breasts and higher cut in the bottoms, replacing the infamous 'Granny pants' look with a more bikini like garment. In 'The Bermuda Triangle Crisis' we have Wonder Woman's diving suit costume. Legend has it that it was originally a bikini in Wonder Woman's colours but Lynda Carter proved too voluptuous for it and kept falling out of the top. In 'The Murderous Missile' we have Wonder Woman's motorbiking outfit and in 'Skateboard Whiz' we have her in her skateboarding gear. In 'The Man who could move the World' we see a flashback of Wonder Woman wearing the season 2 outfit during World War 2 so presumably she modified it during that period. She occasionally also wears her cape in eps like 'The Pied Piper' and 'My teenage idol is missing', sometimes to cover up the safety harness worn for stunt work.

Why don't the villains take off her belt to depower her in the later seasons as they do in the first?

This is good question especially for stories like 'The Murderous Missile' where she is knocked out and at their mercy. Fan theory is that after her experiences in the 1940s she modified the belt and now only she can remove it.Another reason is that the Nazis observed Wonder Woman's powers, managed to kidnap her, and using her lasso on her to get the information on the belt they needed. Only the Nazis seemed to spend the time needed to capture and investigate Wonder Woman.