One of the iconic heroes in comic book history has to be the stretch sleuth known as Plastic Man, created by legendary writer Jack Cole. And from his initial 1941 appearance in Police Comics #1 through that series' conclusion and that of his own title published during that decade, the former Eel O'Brien became a legend. And a desired property for other publishers, particularly DC Comics which acquired the Quality Comics character.
So in 1966 Plas was reintroduced, or rather it turned out to be his son. Then, the original turned up in a couple of early 1970's Brave and the Bold issues teaming up with Batman. But was this the original? And what became of his son? Well after his own revitalized mid-70's series had concluded, he had a string of Adventure/Super Friends/Worlds Finest Comics solo tales. Intermixed, he was affiliated with at least three teams of champions of three Earths!
Once the dust cleared and time helped place things in perceptive, a few facts were made somewhat clear. The initial incarnation of Plastic Man resided on Earth-Two, home to most golden age heroes. Joining the All-Star Squadron as their FBI liason, he would stick around. During this period he met Captain Marvel from Earth-S, and Uncle Sam who moved to Earth-X.
It was the latter that finally motivated Plas to journey with fellow heroes from Earth-Two to this hero-less world to protect it from the Nazi hordes. Sadly, this journey was not kind to this incarnation of Plastic Man, as alluded to by Uncle Sam's cryptic comments decades later. And yet, acording to his "Who's Who" entry, this golden age Plastic Man still survived into the present day even though he was thought deceased on Earth-X!.
During the Convergence event that pulled various cities and their heroes to a planet outside space and time, Plastic Man along with you fellow Freedom Fighter battled the Nazi villain Silver Ghost. During the conflict, Plas and the Ghost formed an uneasy alliance to track down the origin of deadly cyborgs threatening the citizens of their displaced New York City. After a final battle when the Ghost betrayed his foe turned ally, Plastic Man was left outside and separated from the Fighters. Where this version of the hero ended up in the multitude of cities on Telos is hinted at in an encounter Plas would have with Kid Eternity. He didn't return to Earth-Two, as the Senate hearing that tried the Justice Society in the 1980's said that Plastic Man disappeared in the 1940's. Also, there is no recorded meeting of this Plas and his Earth-One counterpart, nor of the other two that appeared on other Earths, although there is a clue as to his arriving at Fawcett City on Earth-S as seen below.
The Earth-One Plastic Man had a documented origin tying him to Earth-One as mentioned in DC Comics Presents #93. He would appear alongside the Justice Lesgue of America in their origIn story and later team up with that world's Batman in Brave and the Bold, then would go on to have solo tales in the 1970's in his own title, Super Friends Adventure and World's Finest Comics! This pliable protector found a foe in the young Robby Reed, the possessor of the H-Dial, enabling him to "Dial 'H' for Hero" which he did over a dozen times in his brief career. Twice Robby become a clone of Plastic Man.
And what of the wacky 1960's son of the original, Eel O'Brien Jr.? This lad teamed up with the Inferior Five in their issue #6, and as latter declared by that group's leader they were from Earth-Twelve, so too would've been both Plastic Man Jr. and his father! And so, the first ten issues of his self-titled DC comic would've been attributed to that world which was destroyed during the epic Crisis.
Then, there was a third Plastic man who appeared alongside Kid Eternity on Earth-S on at least one occasion. While this may, on the surface, seem similar to when Earth-One's Robbie Reed used his Dial "H" for Hero device to transform into the malleable manhunter himself on two occasions, this was the real Eel O'Brien of Earth-Two who migrated to this universe. It was this Plastic Man's exploits in the middle to latter part of the 1940's that were being chronicled in his own self-titled comic and in Police Comics, as mentioned in this particular story... as the Kid was also a native of Earth-S. Additionally, Blackhawk who had tales in his own series during this time also aided Kid Eternity on occasion. As with Plastic Man, it seems Blackhawk... and by extension his six teammates... were called from Earth-X to help Earth-S. And thus, all were presumed dead on Earth-X, according to Uncle Sam's later comments. But these heroes continued to operate into the mid 1950's on this world as chronicled in their Quality Comics tales.
Indeed, this legend stretched himself quite thin, in a sense... as three versions of him and one of his son helped to protect five worlds! So in the end, there was Plastic Man of Earth-Two who was a founding member of the All-Star Squadron and later moved to Earth-X thanks to Uncle Sam then Earth-S thanks to the Convergence and Kid Eternity, while the Earth-Twelve version son of that world's original pliable protector who worked alongside the Inferior Five (in a world with elements of Earth-One and Earth-616 blended together), and the Plastic Man of Earth-One who operated alongside the Super Friends of Batman and Superman who was present during the formation of the Justice League of America.