The character Crinkly Wrinkly appears dressed as Finn from Adventure Time while heading to an "Ooold Folks Home".
I Am Jethro – OK K.O.! Let's Be Heroes (Season 2, Episode 30) [S2E30] I Am Jethro
This sentient Jethro and K.O. bond over their shared feeling of being undervalued by their respective teams. The character Crinkly Wrinkly appears dressed as Finn
Although the sentient Jethro vows to never leave his "brothers," Boxman eventually finds and removes him, though the other Jethros continue to cover for him. Production Context [S2E30] I Am Jethro
The episode builds on earlier Jethro-focused stories like " Jethro's All Yours " and references Mr. Logic's past as a Boxmore bot.
After seeing how poorly other Jethros are treated, the sentient Jethro encourages his "siblings" to revolt.