“Assault on Euphorix” (THE OMEGA MEN #3, 1983)
When Lobo first appeared, he was less “Hell’s Angel” and more “Cirque du Soleil” in his appearance. Nevertheless, looks can be deceiving, and he played a big role in the intergalactic Citadel Wars, coming into conflict with the alien freedom fighters called the Omega Men. Although he initially fought the Omega Men, he later ended up working for them on a job after the wars, where he was sent to infiltrate a Citadel prison facility and free some of the Omega Men’s compatriots. He did this while managing to kill the surviving leader of the Citadel military forces, much to the Omega Men’s relief.
“Where No League Has Gone Before!” (JUSTICE LEAGUE INTERNATIONAL #18-19, 1988)
Lobo resurfaced years later on Earth, after he had taken out a contract on the Justice League from their intergalactic nemesis, Manga Khan. Lobo actually infiltrated the League, and pretended to be their friend for a time (well, pretended as well as he could), only waiting for the signal from his employer to strike.
Eventually, Manga Khan canceled the contract and Lobo went on his merry way, but he never missed an opportunity to travel back to Earth to kick some Super-Hero ass after that. A favorite target of his was none other than Superman. It was during this appearance that Lobo began sporting the look that would make him famous – black leather jacket, long hair, rugged boots, and chomping on a big cigar.
“The Last Czarnian” (LOBO #1-4, 1990-1991)
While under contract to L.E.G.I.O.N., Lobo is assigned to travel to a detention facility in deep space and escort a prisoner off the planet, and he is aghast to learn that the prisoner is not only a fellow Czarnian (a race he thought he had completely wiped off the face of the galaxy), but she was none other than Miss Tribb, his fourth grade teacher. It appears that during her time in the Big House, Miss Tribb has written a biography of Lobo that is quite popular. Despite wanting nothing more than to kill her and make his genocide complete, Lobo’s code of honor means he has to fulfill his contract and deliver her. But he doesn’t have to like it.
Glory Days (LOBO #1-4, 1993-1999)
After his initial mini-series was an enormous hit, the Main Man found himself starring in several specials, one-shots and mini-series, and eventually got his own ongoing series which ran for 64 issues, from 1993-1999. During this time, Lobo’s adventures got even more outlandish, as he took on a contract from Santa Claus to kill the Easter Bunny, attempted to become a pop star, and he even got magically transformed into a teenager for a time, named "‘Lil Lobo." While collecting his various bounties, he has ended up in brawl with nearly every hero in the DC Universe at one time or another, leaving massive property damage, and massive migraine headaches, in his wake.
“Targets” (LOBO #1-13, 2014-2016)
Lobo seemingly dropped off the universal radar for some time, but when the universe altering event Flashpoint happened, a new version of Lobo emerged on the scene. This Lobo was a Czarnian slaver who killed the rest of his race, except for the love of his life, the Princess Sheba. This iteration of the character was much more clean cut and thin that the previous version, someone the previous Lobo would call “a fraggin’ emo pretty boy.”
This version of Lobo, who was much more refined, was originally the bodyguard to the Czarnian Royal family, and due to a strange ritual involving the planet's "life blood", he was able to gain regenerative abilities, connecting himself and the planet’s Emperor to the entire world. However, a contamination occurred in this "life blood", causing the Czarnian Emperor and any Czarnians who underwent the ritual to go totally insane. This tragic event is what forced Lobo to commit planetary euthanasia, whereas before he pretty much did it just for fun. A Lobo who resembled the pre-Flashpoint emerged on Earth, but was said to be an imposter.
The Old Bastich Returns (JUSTICE LEAGUE OF AMERICA #1-29, 2016-2017)
Following the events of 2016's DC UNIVERSE REBIRTH #1, the previous Lobo was seemingly erased from existence (though he was actually kept in a bottle by the intergalactic collector Brainiac). The original Lobo returned to continuity, and it was revealed that he had been a member of Amanda Waller’s original line up for the Suicide Squad. When the original Squad’s mission ended in disaster, leaving most of the team in comas, she locks them away in a special, secret prison, hoping to bury her mistake from prying eyes. However the manipulative industrialist Maxwell Lord finds out, and seeks to use this original Squad to strike at Waller.
Lobo is one several villains used by Amanda Waller who is then freed by Maxwell Lord, who uses his mind control powers to force Lobo to do his bidding. The Batman finds a way to implants a bomb into Lobo's brain and manages to detonate it, blowing his head right off. After Lobo regenerates it, he discovers Batman did this as a way to free him from Lord's mind control, and later accepts Batman's offer to join the latest version of the Justice League of America, as a way of paying the Dark Knight back for freeing him from Lord’s influence.