Masters of the Universe/Teenage Mutant Ninja Turtles: Turtles of Grayskull

Masters of the Universe/Teenage Mutant Ninja Turtles: Turtles of Grayskull #1-4

by Tim Seeley, Freddie E. Williams II (illustrator), Andrew Dalhouse (illustrator)

Buckle up for the team-up of a lifetime with The Masters of the Universe/Teenage Mutant Ninja Turtles: Turtles of Grayskull!

When the Teenage Mutant Ninja Turtles came across Krang and Shredder making a deal with some otherworldly ‘demon-mage’ named Skeletor, things got hella-weird and they ended up in ETERNIA! It turns out, when you mix Utrom mutagen with demon magic you get a nasty purple poison—and it’s brought Eternia to the brink of chaos. So, Leonardo, Raphael, Donatello, and Michelangelo are teaming up with The Masters of the Universe to kick some blue boney butt. The only problem is…He-Man is missing in action.

In this thrilling adventure, the Ninja Turtles and He-Man will find themselves pulled together across timelines and cosmos, again and again. A stolen time-scepter causing knots in the universe will cause irreparable damage to all existence unless the Ninja Turtles and He-Man—with the help of apprentice Timestress Renet Tilley—can find and defeat the mysterious force behind all this mayhem.

New York Times bestselling author Tim Seeley and Eisner-Award winning illustrator Freddie E. Williams II join forces to bring fans this awesome and long-awaited crossover.

Collects Masters of the Universe/Teenage Mutant Ninja Turtles: Turtles of Grayskull #1–#4.

Genres: Comics, Graphic Novels, Fantasy, Graphic Novels Comics

120 pages, Paperback

First published November 11, 2025

About the author

Tim Seeley is a comic book artist and writer known for his work on books such as G.I. Joe: A Real American Hero, The Dark Elf Trilogy, Batman Eternal and Grayson. He is also the co-creator of the Image Comics titles Hack/Slash[1] and Revival, as well as the Dark Horse titles, ExSanguine and Sundowners. He lives in Chicago.

Reviews

[Khurram · Rating 4 out of 5]

I wanted to give this book 3.5 stars, but i had to round it up. The book is total chaos. For everything I love about this book. The main characters are done well all their powers, skills and personalities are done correctly but you add in the chaos of a time travelling blundering novice. That is what spoils it for me.

He-Man and the Turtles are on each other's world. However they are not supposed to meet or be together or the results are catastrophic.

As much as I like the artwork the fights and the characters. Having the story all over the place and at different points of time made me take a star and a half off. The book finishes with a huge cover gallery and a sketchbook.

[alpacaman · Rating 3 out of 5]

Okay I guess. Beautiful art. I was never really into Turtles. I was a He-Man/Transformers kid. This story is kinda all over the place but it is about the time stream going haywire. Awesome to see Ninjor!

[Robin · Rating 3 out of 5]

One extra star for the artwork

[Peter · Rating 2 out of 5]

Very well drawn.
Other than that, unnecessarily convoluted story that was really quite hard to follow. I thought a crossover could have been done in far more interesting way.

[Andrew · Rating 3 out of 5]

Overall the story was interesting, but it really needed more time to develop. Everything feels so rushed as we jump quickly around multiple plots.

[Mutant Mike · Rating 2 out of 5]

I liked how they tied Ninjor into both universes, and Freddie Williams' art is top-notch as always, but the story was bizarrely structured and desperately needed some breathing room to let things develop and resonate. Tracking down the mini comics didn't help clarify the plot, either. I usually love crossovers, and this one should've been a home run for me, but it just didn't quite land.

[Kenny Ketner · Rating 5 out of 5]

fun crossover, honestly way better than I expected!

[Online Eccentric Librarian · Rating 3 out of 5]

More reviews (and no fluff) on the blog http://surrealtalvi.wordpress.com/

This mashup of 80's legends you never knew you wanted gives you pretty much exactly what you'd expect from the title. It is campy, weird, occasionally funny and in many ways even feels like an 80's comic with its style and story. Both of them are from my childhood and when I heard of this I knew I had to give it a try.

The story takes on a funky cross-time caper where Skeletor and Splinter have joined forces and our half-shelled heroes team up with He-Man. As you can imagine, the story itself is nothing amazing and only serves to drive us from one action sequence to another. There are some moments of calm in the chaos but they feel a bit lost.

The main pull is of course the mashup itself and this is done fairly well. The characters feel like themselves, even if a bit thin. The action is over the top as it should be yet often feels too much as we move from one scene to another at a pace that feels like the author tried to cram in every idea they ever had into this one series. The way our heroes are treated is quite nice, whereas the bad guys end up just being comic reliefs.

Art is occasionally great, occasionally messy. Parts feel like you're reading Heavy Metal magazine with the style, chaos and occasional graphic violence that would never have been seen in the original series. Some of the character designs, like the turtles in MOTU gear, are lots of fun.

Overall I enjoyed this, but honestly was hoping for a bit more heart and soul. What we get instead is mostly a crazy adventure that is fun to read but you're unlikely to return to it or read it again. If you're old enough to have liked these back in the 80's this'll give you a bit of a nostalgia trip and if you are in that target audience you should check this out. Reviewed from an advance reader copy provided by the publisher.

[Richard Pulfer · Rating 4 out of 5]

What a fun way to end the year.

I was somewhat disappointed with Injustice vs. Masters of the Universe - from the same team - and kind of worried the same fate might be fall this crossover, but I was happy to say that wasn't the case.

A TMNT/Masters of the Universe really feels like peanut butter and jelly.

It turns out Prince Adam and the Turtles have a lot in common, and the book does a great job drawing on that.

There is a significant time travel plot, which kicks off in media res, with the Turtles already in Eternia fighting Skeletor, Shredder and even a mutated He-Man before circling back to the past to show what started this all.

It's all a bit complicated, but at the certain point you have to take the plot at face value and just enjoy the sheer fun of watching the TMNT, their friends and allies - including Casey Jones and April O'Neil - team up with the likes of the Masters of the Universe.

The art really works here, and all and all it's a super-fun was to close out the year.

[Roberto Diaz · Rating 3 out of 5]

Good presmise and art. Not so good execution.

Being fan of Freddie Williams II previous Turtles crossovers, plus his He-Man and Thundercats book with David and Goldfine, I was interested in his team up with his current partner in the Darkhorse MotU new series, Tim Seeley. This series seem like a missed opportunity, hastily written, to the point that the time travellig is not that boring, but the feeling that the best bit of this adventure happen off-creen, like a four part pitch to other stories. The characters are wiitte well, with Seely finding common ground between both main groups, but the pacing is all over the place. Maybe with two more issue to flesh out the story and tweaking here and ther something etter might have been presented, but is not an absolute downer, the good ideas are there, hope Williams, Seely and co. have the opportunity to show us more.Still great multi character splas-pages and a lot of cameos.

For fans of the characters, a fun, if bumpy ride.

[Naomi Starling · Rating 4 out of 5]

The minute I discovered this crossover existed, I HAD to have it THAT DAY!!! I rarely invest such money into one book, and although the crossover did not hold up to my hopes, I am still very glad, tickled even, that this story exists! It's wonderful to see the two universes combine, and Prince Adam and the boys, especially Man at Arms and Donnie, get along very well, as fans might expect. :) Splinter has an awesome role and is very handled very well, something that no all artists/authors master despite his importance.

The writing was, at times, a bit simple, but that's often an issue with the TMNT comics. They seem to either hit hard to barely hit at all, and I fear this was one of the latter. My biggest complaint would be the Time Mistress, or whatever she was called -- we don't need more Mary Sues in the TMNT world. After all, we already have April!

[Paul · Rating 5 out of 5]

The comic book is a hybrid medium; both writing and artwork must serve the story equally. Here both elements are doing just that. Writer Tim Seely and illustrator Freddie E. Williams II understood the assignment and delivered in spades. For my money, there's nothing better. Each of Williams' panels is a treat to behold; he revels in anatomy, taking up the mantle of the great Frank Frazetta. I had toys from both of these franchises as a child, and I once tried Shredder's cape on Skeletor for size. The combination looked great all those years ago, and it works great here, thanks to the hard work and care taken by amazing artists and creators.

[MrsEnginerd · Rating 5 out of 5]

As a child of the 80s, raised on He-Man, She-Ra, superhero comics and the ever awesome pizza eating TMNT, this was the crossover I didn't know I needed! The artwork blew me away! The chaos of the narrative was nicely held together by the camaraderie of these teenagers tasked with protecting literally the entirety of creation.

It was nice to see the lore of Eternia tied in to the Oooze; the many ways history could have played out if these characters had the opportunity to exist in the same universe. The fact that every single protagonist of both comics gets to participate meaningfully blew my mind!

Solid 4.5!

Enjoy!

[Robert Bussie · Rating 2 out of 5]

The good news first. The art is fantastic with various perspectives and the coloring is AMAZING.

The bad news. The story is terrible. I have been a fan of Tim Seeley's writing since the early days of his very enjoyable Hack/Slash series. I have read other things he has done such as Moneyshot, Nightwing, Revival, etc. and liked them. This however, is waaaaaay to wordy and complicated for a small four issue miniseries. It is very disjointed and feels like it was meant to be double the size, but was cut down at the last minute causing the story to be rushed and missing sections.

[Derrick O'Rourke · Rating 3 out of 5]

Enjoyable read

This is an enjoyable read and there are some funny moments but the main plotline is a bit all over the place. It feels very overly complicated for what should be a reasonably straightforward series. The mini comics with the figures were better reads. They have good moments with meant and shredder at least.

[Alan · Rating 3 out of 5]

The art delivers in the usual way, but I’m guessing this ties into the comics that came with the figures from the corresponding toyline, so the beginning was hard to follow. You get some context later, but Seeley shines here in the dialogue but the plotting could’ve been a lot tighter.

[STEVEN B ABBOTT · Rating 5 out of 5]

80s & 90s nostalgia at its finest

Sometimes mash ups of different IP work and sometimes they don’t. This one surely does. I really enjoyed this book and highly recommend it. A great tale letting both the villains and heroes shine.

[Aaron Golding · Rating 3 out of 5]

The artwork is great, and the story is interesting, but the dialogue and narration are often quite exposition-heavy. This means that you're either rushed through new ideas/events, or slowed down in the introductory scenes of issues #2 to #4 (the opposite of what great writing should do).
3.5 stars

[Donavon · Rating 4 out of 5]

at first, thought I was missing something without the mini-comics. then realized it was supposed to be a little confusing, which all wrapped up nicely.

as far as MotU crossovers, not as good as the Injustice crossover.

[Super Saiyajin Raditz · Rating 3 out of 5]

Fun crossover, personally not my thing but the artwork was really nice. Kind of a bloated fast paced book that boils every character's personality way down, but if you're a kid or you just want some He-Man & TMNT nostalgia, this is the book for you.

[iamjacsmusings · Rating 3 out of 5]

As with a lot of these crossover titles, the characterisation is there but there's too much plot for the issues allowed. This could conceivably be six or even ten issues comfortably considering they want to tell.

Half-she(ll)xcellent.

[Dan · Rating 4 out of 5]

I'm not sure I totally loaved the climax, but it was He-Man and TMNT at the end of the day.

Read as single issues.

[Andreos H · Rating 3 out of 5]

Ja echt, ein Crossover... aber man hätte es alles ein bissl besser machen können.

Sowohl die Story, als auch die Zeichnungen. Dennoch 3/5 für ein seltene Charaktere, die drin vorkommen.

[Daffy · Rating 4 out of 5]

A bit confusing at points, and both the beginning and ending felt a tad rushed. Still, I did enjoy myself quite a bit.

[Rickey · Rating 3 out of 5]

This was all over the place. Art was gorgeous but the story was incredibly convulted. I dislike time travel.

[Larry · Rating 5 out of 5]

This might be one of the wildest stories I’ve read. It’s a crazy mashup but in a way that’s fun for fans of both. I found it entertaining and really enjoyed the artwork.

[Nate Balcom · Rating 3 out of 5]

Book #11 of my #30BookSummer Challenge! Turtles of Grayskull by Tim Seeley. Two of my favorite childhood cartoons collide in a radical adventure. Recommend eating pizza while reading it!

[Eldon Farrell · Rating 2 out of 5]

Very confusing. A poorly laid out story that at least had somewhat decent artwork :(

[Brad Gunnell · Rating 2 out of 5]

SO much promise here destroyed by a convoluted and rushed plot. Earned stars for the nostalgia of my two favorite franchises and the incredible art. Incredibly disappointed in this.

[Julio Bonilla]

Serious command of the stage, bro.