super-2
Explanation
This comic is a parody of Superman's origin story, specifically the well-known element that Superman (Kal-El) is the last son of Krypton, sent to Earth before his planet exploded.
In the first panel, Superman tells an alien to tell him about being "the last son of Krypton." The alien asks what he means by "last son." Superman lists the possibilities: "The last son? The last child? The last person?" But the alien responds that actually, he just left before the planet exploded -- implying Superman wasn't the "last" anything in any dramatic sense.
The twist comes when the alien reveals that "before we left, there was a note." The scene then flashes back to show Superman's parents leaving a note that reads something to the effect that they were "just going out for cigarettes and would be right back" -- a classic joke referencing the trope of a deadbeat parent who abandons their family under the pretense of "going out for cigarettes" and never returning.
The final panel punchline -- "Did Superman's dad boot him to space?" -- drives the joke home: Superman's heroic origin story of being the last survivor of a doomed world is reframed as his dad simply abandoning him, using the destruction of Krypton as a convenient excuse. This deflates the grand mythological backstory of one of comics' most iconic heroes into a mundane tale of parental abandonment.
The humor operates on multiple levels: the subversion of Superman's tragic origin, the "going out for cigarettes" deadbeat dad trope applied to an alien civilization, and the absurdity of recontextualizing an entire planet's destruction as a cover story for ditching your kid.