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(from Wikipedia): "Despite their differences, Bizarro and Superman have teamed up on occasion. One notable example happened in Superman #379, when a strange creature appeared to be devouring Bizarros. Fearing he would end up alone Bizarro tried to steal Superman's duplicator ray. Superman convinced Bizarro he would be better off trying to stop the monster before making any more Bizarros. 

The creature eventually devoured Bizarro, but Superman soon figured out that the creature was not trying to kill the Bizarros, but using their combined strength to defeat another creature which was trying to destroy htraE. The first creature was created as part of a plan developed by none other than the Bizarro Lex Luthor, who Bizarro referred to as a "punk hero."

"In the imaginary story, Superman: Whatever Happened to the Man of Tomorrow?, which served as an ending to Silver Age Superman continuity, Bizarro #1 (the original Bizarro and the world's leader/greatest hero), was influenced to bad ends by the now evil Mr. Mxyzptlk. Realizing that to truly fulfill the Bizarro Code he should stop being an "imperfect perfect duplicate" of Superman and be a "perfect imperfect duplicate" of Superman, Bizarro resolves to alter his methods accordingly. To that end, Bizarro #1 deliberately destroyed Bizarro World, reasoning that if Superman's homeworld (Krypton) was destroyed in an accident, Bizarro must destroy his own world on purpose."

"The Bizarro World's final pre-Crisis appearance was in DC Comics Presents #97 (September 1986), which was also the final issue of that series. After being empowered by a hideously disfigured Phantom Zone sorcerer, Mr. Mxyzptlk destroys Zrfff and then causes the Bizarro World to implode, killing all its inhabitants. The Bizarros act unusually insane in this account, with Bizarro #1 rocketing his son to the core of the collapsing planet so he would be sure to die."

"It had been established that there was no "set" future for Earth-One[7] so the World's Finest story where it is revealed that sometime in the future, Htrae is transformed into a more normal world (egg-shaped rather than cubical) by the radiation from an exploding celestial body was only a possible future. The Bizarroes are changed into normal non-powered people as well, but still retaining vestiges of their Bizarro laws (curtains hung outside the windows of a house, etc.)[8]"

"A Bizarro World did appear in a story of this era in the 1998 Adventure Comics 80-Page Giant by writer Tom Peyer and artist Kevin O'Neill. There, Bizarro demands that a technician at a SETI-like installation broadcast his diary. Having no choice, the technician looks over the diary, which retells the story of the classic cube-shaped backwards Bizarro World. Superman accidentally finds himself there and, to allay people's fears of him,[b] goes on a "constructive rampage." 

The original Bizarro, aka Bizarro #1, goes to Earth and attempts to stop Superman with the help of his friends. However, when the other Bizarros try to kill Superman, #1 stops them, saying that killing is the earthly thing that they must, above all, do the opposite of. Realizing that, however strange Bizarro World might be, its inhabitants are safer and happier than those of Earth thanks to Bizarro #1's leadership, Superman apologizes. 

To show his sincerity he hides a copy of the Bizarro Code where nobody will ever see it. The people hold a parade in #1's honor and with his loving wife Bizarro Lois #1 and their son, Bizarro Junior #1 at his side, Bizarro cries saying "Me am ... happiest creature in universe." When the technician finishes reading the story, he sees Bizarro is gone and, horrified, asks, "What if the journal itself is no exception to the Bizarro Code?". Elsewhere, the truth is revealed; Bizarro, who has no home and has no family and is held in contempt by Superman, weeps because he is the most miserable thing in the universe." 

"The area Superman lands in resembles a destroyed city. There is also an imperfect duplicate of the Ytrebil fo Eutats visible in the background, although unnamed. Htrae vanishes back into the Underverse, a newly discovered dimension, at story's end.[15]"

"In Grant Morrison's Multiversity series, htraE has been allocated its own alternate universe and is now also known as Earth-29. "

"Comics

The underground comic Anarchy Comics #2 story "Kultur Dokuments" by Jay Kinney and Paul Mavrides features the "Political Bizarros" as antagonists of the Picto family. 

The Political Bizarros are highly dogmatic Marxist-Leninist sectarians who are look and talk like Superman-universe Bizarros, in strong contrast to the pictogram world around them. They belong to two rival political sects, the International Caucus of Political Bizarros (patterned after the then-leftist Lyndon LaRouche group, International Caucus of Labor Committees) and the Progressive Bizarro Party (paterned after the Progressive Labor Party (United States))."