###Birdy the Mighty / Tetsuwan Birdy
[quote]Genres: action, science fiction
Themes: alien, body switching
Objectionable content: Significant
Plot Summary: Tsutomu, an average middle school kid busy studying for the final exams to enter high school runs into a man running from someone and gets caught up in the chase. In all the confusion he is accidentally killed. Luckily Birdy (an interplanetary agent) knows a way to save him, unfortunately that means joining bodies to become one. So now he is stuck with this officer and along for the ride capturing criminals and saving lives.
Number of episodes: 4
Vintage: 1996-07-25[/quote]
ANN Info Page
###Birdy the Mighty: Decode / Tetsuwan Birdy Decode
[quote]Genres: action, science fiction
Themes: alien, body switching, space
Objectionable content: Significant
Plot Summary: Federation investigator Birdy chases the space criminal Geega through space to Earth, where he hides in the entertainment industry under a human disguise. Birdy goes undercover herself, posing as famous model “Arita Shion” that often uses a ‘space girl’ look. A male student, Senkawa, stumbles upon a fight between the two one night in an abandoned building only to be severed in half as he is used as a shield by Geega against Birdy. Birdy heals him from imminent death in some fashion- but Senkawas body, and life, are now changed and permanently linked to Birdy.
Number of episodes: 13
Vintage: 2008-07-04 to 2008-09-26[/quote]
ANN Info Page
###Birdy the Mighty Decode:02 / Tetsuwan Birdy Decode:02
[quote]Genres: action, science fiction
Objectionable content: Significant
Plot Summary: Birdy and Tsutomu are still co-existing in the same body, as Birdy continues her duties as Federation Investigator and celebrity persona, and Tsutomu seeks to balance them with his normal everyday life. When a criminal group connected to the Ryunka incident escape from custody, hiding themselves and their alien identities on Earth, Birdy and Tsutomu are thrown back into action. It seems, however, that there are other forces involved, as well as old faces, which give Birdy time to reflect on the past, and the people that influenced her.
Number of episodes: 12
Vintage: 2009-01-09 to 2009-03-27[/quote]
ANN Info Page
Birdy the Mighty Decode: The Cipher (OAV) Vintage: 2009-07-22
Who put the Dragon Ball Z in my Birdy?
###FUNimation Issues Recall of Birdy the Mighty: Decode Part 1
Posted on: Wednesday, October 20, 2010
FUNimation has issued a recall of Birdy the Mighty: Decode Part 1. The set’s UPC code is 704400067204, and it was scheduled to street October 26, 2010. For customers who have purchased this item from our store and already received it, please hold off on shipping your box sets back to us. We are currently working with FUNimation in order to have replacement discs sent to you so there will be no need to return the entire collection. We will have more details within the next few days. If you have any questions, please contact our customer service representatives.
Thank you in advance for your patience.
Pending orders will be filled with the replacement item which is scheduled for release on November 30, 2010.
So from reports it looks like the disc 2 actually contains Dragon Ball Z Season 4 disc 2 instead of the second part one disc. 
