Modern Love or The Return of Nano (Paramount lists one title, the episode lists the other) is another filler episode. Remember Nano, the weird little trash Frankenstein nanomachine swarm that thought a conman was its dad and then the Turtles threw it in an incinerator? Well, it’s back. Turns out “fire and smushing” isn’t enough to kill a nanobot swarm. Moreover it’s spent the months since being squished and left for dead watching old Leave it to Beaver style sitcoms and decided that it wants a family, and that means reconnecting its father (aforesaid conman and thief) with its mother (the scientist lady who built Nano in the first place and immediately marked it for destruction when it developed any emotional attachment to anyway).
Naturally it does this by bashing down the prison walls to steal its dad and abducts its mother by turning its body into a huge people stealing vending machine golem, then forcing them to live out its Dennis the Menace dreams of a stable nuclear family.
The Turtles try to stop this partly out of Donny feeling somewhat obligated to be nice to machines and many because “trash monster is engineering prison breaks” seems like a TMNT kind of problem.
Also, it should be noted, the criminal and the scientist have *never* met each other before, do not like each other, and blame one another for the fact that their emotionally fragile mecha baby kidnapped them, and Nano reacts as one would expect a small child watching their parents fight would. Difference being that this small child is the size of a small building and can conjure mechanical saws and spikes when it’s upset. Nano eventually takes his forced family to Coney Island since, for one thing, that’s where Happy Family’s go and he wants his parents to be happy, and partly because that’s where the criminal stashed all his stolen goods… and being obscenely wealthy through crime is what makes *him* happy. This also interferes with Casey and Aprils working date, as Casey got a part time job repairing the rides at the park.
This is also when the Turtles catch up with them, and Nano remembers the last episode where they all teamed up to beat the crap out of him, set him on fire and squish him to death, so he’s really not willing to give them the benefit of the doubt on being his friend, and a fight breaks out between the Turts and Nano, now a Kaiju made of broken rollercoasters, until Donny whips up an EMP strong enough to disable the nanomachines holding his body together; killing Nano and setting his captives free. Well… except the father who is immediately thrown back in jail. And April is given a reward for giving back the stolen loot Nano retrieved and now has enough money to rebuild her home that Shredder burned down a dozen or so episodes ago. And the scientist continued her goal of becoming a God Empress of an Emotionless Nanomachine Race?
What A Croc feels more consequential, narratively and has not one but two references to the original cartoon and neither are there to ridicule it! Wild, I know!
Mikey is helping Don test some SCUBA equipment he whipped up in his spare time (can’t… turtles breathe underwater?) which affords him the chance to explore the deep, submerged parts of the Sewers they’d never been in before. And immediately he finds a giant crocodile man in a lab coat; Leatherhead, working on an Utrom exoskeleton.
He isn’t Cajun, which is a big mark against it, but he does sound like someone doing a convincing enough Micheal Dorn impression that I can pretend he’s Worf.
The turtles are weirdly reluctant to accept Mikey’s reports of there being a giant nuclear crocodile man in the sewers considering… every word of how they identify themselves.
Anyway, Mikey goes back and finds Leatherhead again and, after a quick misunderstanding introductory fistfight with the other Turtles they quickly learn that he’s a very nice crocodile man, who just has a bit of an anger management problem that he’s pretty good at handling honestly. He’s more 90s Hank McCoy than Bruce Banner.
Leatherhead explains his origins which were, in fact, nearly the same as the turtles; he was a pet crocodile who got flushed down into the sewers, where he was found and adopted by some Utrom cleaning up from a Mutagen spill they accidentally flushed. He was a beloved pet at first, and then they upgraded him to “friend and coworker” when they realized the ooze also turned him into a super intelligent giant crocodile man.
He was, unfortunately in the basement when the military raided the TCRI building and the Utrom left Earth so he was left behind and presumed dead by his adopted family, but he actually slipped into the sewers to try to build his own Transmat so he could return to the Utrom home world and reunite with them.
It took the Utrom, like, 800 years to do that and that’s with the resources of a major corporation behind them so… slow going, but he’s at least had the help of another brilliant scientist who wants the same goal.
Who it turns out is Baxter Stockman, now a disembodied head in an Utrom skeleton which is at least a big step up from “disembodied head on spider legs”. Moreover, he’s been using Leatherheads expertise and the spare Exoskeleton parts laying around to build a weapon that can match and kill the turtles; the robot Ninja Turtle Metalhead.
This leads to a really well animated fight between the turtles and Metalhead, where they’re outmatched until they realize that he’s copying their moves so… just attack him all at once and swap around weapons and he can’t keep up with them.
Unfortunately Baxter also accidentally mentions working for Shredder in the past, which sets Leatherhead into a rage (never met the guy but he knows the Utrom hated him), and in that ensuing fight he winds up bringing down the roof of the underground lab; Leatherhead sacrifices his life to save the Turtles, realizing he was never going to get a chance to reunite with his family and he wanted to save his friends (he knew them for, five minutes, he is ludicrously quick to befriend people) and the Turtles leave slightly bummed that Leatherhead died and annoyed that Baxter did not.