There are 3 books in the Zita the Spacegirl series. The newest book is The Return of Zita the Spacegirl which came out in 2014.

1
Zita the Spacegirl

Book cover of Zita the Spacegirl
A NEW YORK TIMES BESTSELLER Zita's life took a cosmic left turn in the blink of an eye. When her best friend is abducted by an alien doomsday cult, Zita leaps to the rescue and finds herself a stranger on a strange planet. Humanoid chickens and neurotic robots are shocking…
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2
Legends of Zita the Spacegirl

Book cover of Legends of Zita the Spacegirl
A NEW YORK TIMES BESTSELLERBen Hatke brings back our intrepid space heroine for another delightful sci-fi/fantasy adventure. Zita is determined to find her way home to earth, following the events of the first book. But things are never simple, and certainly never easy, in space. Zita's exploits from her first…

3
The Return of Zita the Spacegirl

Book cover of The Return of Zita the Spacegirl
Zita the Spacegirl has saved planets, battled monsters, and wrestled with interplanetary fame. But she faces her biggest challenge yet in the third and final instalment of the Zita adventures. Wrongfully imprisoned on a penitentiary planet, Zita has to plot the galaxy's greatest jailbreak before the evil prison warden can…