1 {scene: The Head Death's desk.}
1 Head Death: Ah, Sat On By A Giant Frog, sit down.
1 Death of Being Ground By A Mars Rover Rock Abrasion Tool (currently Sat On By A Giant Frog): Yes, sir.
2 Head Death: Leonardo da Vinci's Vatican Library trap has been triggered.
2 Death of Being Ground By A Mars Rover Rock Abrasion Tool (currently Sat On By A Giant Frog): The giant frog one?! Anyone die?
3 Head Death: No. But it's your job now to go reset it.
3 Death of Being Ground By A Mars Rover Rock Abrasion Tool (currently Sat On By A Giant Frog): What?
3 Head Death: Part of the deal we made with Leonardo.
4 Death of Being Ground By A Mars Rover Rock Abrasion Tool (currently Sat On By A Giant Frog): He was a canny old bastard...
4 Head Death: Is a canny old bastard...

Okay, the Death theme, after a long hiatus, is flying thick and fast now.

Death of Being Ground By A Mars Rover Rock Abrasion Tool was last seen way back in #452, being demoted to the role of Sat On By A Giant Frog, which is why he's here now.

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2018-01-14 Rerun commentary: The obvious implication of this strip is that Leonardo is somehow still alive. Yep, Leonardo is so canny that he can outsmart even Death. I didn't particularly go anywhere further with this hint, but it's a nice thing to drop little backstory hints like this occasionally without explaining them further. Gives the fans something to speculate on.