A Noble Sacrifice (DOOM PATROL #121, 1968)
In an era when Super-Heroes always saved the day and walked away from a battle, the Doom Patrol sacrificing their lives to save a small town full of strangers was unprecedented. In this story, the Doom Patrol's enemies Madame Rouge and Captain Zahl force the team choose between saving their own lives or those of the tiny town of Codsville, Maine. Without a second thought, the heroes offer their lives in exchange for that of the townsfolk, and sacrifice their lives to save innocents. Robotman's "death" in this issue would remain for nearly a decade.
"The Doom Patrol Lives Forever!" (SHOWCASE #94, 1977)
After being declared dead for years, Robotman returns, and is seemingly the only original member of the team to make it out alive. In an all-new robot body, Cliff goes back to his teammates' old headquarters, where he discovers a new team of super powered heroes going by the name Doom Patrol, including Celsius, Tempest, and Negative Woman. After briefly fighting them, feeling they had not earned a right to that name, he ends up joining their ranks after the original team's old foe General Immortus returns.
“Crawling from the Wreckage” (DOOM PATROL #19-22, 1989)
After being one of the only survivors of the Doom Patrol for a second time, Cliff accepts joining a new iteration of the team when asked by the Chief, a.k.a. Dr. Niles Caulder, the team's original founder. This strange new version of the group are pitted against the Scissormen, who are part of a volatile "philosophical location" that has escaped into our reality and threaten to destroy it. Realizing there are threats out there simply too bizarre for the likes of Superman and Batman to know how to handle, Robotman dedicates his life to the strangest version yet of the Doom Patrol, one which ultimately resides on a living street named Danny, who serves as both team member and team headquarters.
“The Wrong Way to Do Right” (DOOM PATROL #1-22, 2001-2003)
After several years having bizarre adventures with Crazy Jane and other members of the more surrealist version of the Doom Patrol, Robotman resurfaced, having sold the name and copyright of the Doom Patrol to the billionaire Thayer Jost, CEO of the Jost Corporation, which was looking to start their own corporately sponsored super team. As it turned out though, the Robotman who was a member of this version of the team wasn't the real thing, but a copy. The real Cliff Steele eventually turned up, and replaced his doppelganger on the team, which ultimately ended up being short-lived.
History Repeats Itself (MY GREATEST ADVENTURE #1-6, 2011-2012)
In the post Flashpoint DC Universe, we get the altered origin story of Robotman, which does not initially involve the Doom Patrol. In this new origin tale, we see how Cliff Steele was approached the scientific cooperative called U.N.R.E.A.S.O.N. to be injected with nanobots, which could repair his body when gravely injured. After a horrible accident, the nanobots kick in and transform Cliff into Robotman.
Some time later, a mysterious woman asked Cliff to find her husband, a man named Dr. Turing. He eventually found out that Dr. Turing was responsible for the accident that resulted into his transformation (which he would later find out also involved Dr. Niles Caulder.) When Cliff tries to kill the doctor, his Nano-bots won't allow him to murder. He returns to the Las Vegas area, and sets up shop as a private investigator.
“Brick By Brick” (Doom Patrol #1-6, 2016)
Following the events of DC Universe Rebirth #1, Robotman's origins seemed to revert to what they were prior to Flashpoint. When a young EMT named Casey Brink is witness to Robotman being hit by a garbage truck, she finds herself pulled into a new iteration of the Doom Patrol, one that evoked the team's surreal glory days of the '90s. And once again, Robotman found himself in the middle of it all, fighting side by side with the teammates he'd known for years.