In the story, we’re introduced to Renet, a time-travel witch with no pants who acts as an apprentice to a strict master, who she’s deathly afraid of. After screwing up, she steals a magic scepter and hides out in 1986 New York City, immediately coming into contact with the Turtles. Escaping her master once again, she brings all of them to 1406, where they run afoul of Cerebus the Aardvark. The three parties reluctantly team up with the easily-disgruntled Cerebus annoyed by the mere presence of the Turtles while the Turtles are constantly annoyed by Renet’s never-ending, airheaded attitude. A year after this issue, the Turtles and Cerebus – once again depicted by Eastman, Laird, and Sim – would briefly meet up in the pages of Miami Mice #4, where Cerebus again wanted to distance himself from the four.

Also in 1986, the memorable Donatello Micro-Series issue (the one where he teamed up with Jack Kirby) ended with a pin-up by Stan Sakai, depicting the Turtles surrounding his own anthromorphic swordsman creation Miyamoto Usagi from the comic Usagi Yojimbo. 1987 brought us a comic called Turtle Soup, where various comic creators would do short stories featuring the Ninja Turtles. Sakai got to write a storyline where due to some magical residue brought on from his adventure with Renet, Leonardo is sent spiraling through time and ends up in an adventure with Usagi. The two are attacked by the same pack of enemies and cut them down until they are the only ones left. They turn their attentions to each other and are about to go at it, but Leonardo returns to the present, causing Usagi to run through nothing and crash into a tree.

read more: The Original Teenage Mutant Ninja Turtles Movie is Still Amazing

That began a lengthy relationship between the two properties. Miyamoto Usagi became the Alien to the Ninja Turtles’ Predator. In the Mirage comics, Leonardo made several more trips into Usagi’s time and eventually brought his brothers with him. Usagi got his own action figure as part of Playmates’ Teenage Mutant Ninja Turtles line, showed up in a couple video games, and two of the animated series. In the ’80s cartoon he was named Usagi Yojimbo, I suppose for simplicity’s sake, where he was stranded on Earth after being pulled in from an alternate reality. He starred in two episodes.

The 4Kids cartoon had him show up more often, also from an alternate reality, though they played up his relationship with Leonardo more than the ’80s cartoon. When they did the Flash Forward part of the series where the Turtles were in the future, they intended to introduce his comic book descendant Space Usagi, but that never came to be.