OK K.O.! Let's Be Heroes (2017–2019)
3 user

Crossover Nexus 

When KO finds himself trapped inside an mysterious place, he encounters other Cartoon Network Heroes and they band together to escape.


Ian Jones-Quartey (creator), David Alegre (as Dave Alegre) | 9 more credits »




Episode cast overview:
Ian Jones-Quartey Ian Jones-Quartey ... Pen (voice)
Courtenay Taylor ... KO (voice)
Michael Dorn ... Red Strike / I.M. Weasel (voice)
Estelle ... Garnet (voice) (as Estelle Swaray)
Tara Strong ... Ben Tennyson / Raven / Ilana (voice)
John DiMaggio ... Four Arms / Shnitzel / Jake the Dog (voice)
Peter Browngardt Peter Browngardt ... Uncle Grandpa / Festro (voice)


When KO finds himself trapped inside an mysterious place, he encounters other Cartoon Network Heroes and they band together to escape.

Plot Summary | Add Synopsis




Release Date:

8 October 2018 (USA) See more »

Company Credits

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Technical Specs


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Did You Know?


Originally One-One from the upcoming Cartoon Network show Infinity Train (2019) was going to join the group containing Ben 10, Garnet, Raven and KO and not a stone cameo. But the creators found it to be a cheap way to promote one of the network's new shows. See more »


References Mighty Magiswords (2015) See more »

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User Reviews

Everyone's come a long way!
6 November 2018 | by ericstevensonSee all my reviews

This may very well be the most epic crossover in the history of Cartoon Network. We get Ben from "Ben10", Garnet from "Steven Universe", the title character of K.O., and Raven from "Teen Titans Go!". I've never even seen a single episode of "OK KO!" before. I just had to watch and review something that had so many characters in it. There's literally dozens of other characters that are just brief cameos. We finally get a cameo in another Cartoon Network show with Courage The Cowardly Dog!

I've been waiting forever for him to appear. It's great to see four characters from different shows contribute to the story as it's usually just two shows. They are mentioned as having come from different dimensions. I wonder how many of the other crossovers are canon? The one between "Codename: Kids Next Door" and "The Grim Adventures Of Billy And Mandy" showed them all in the same universe. By the way, the comic book crossover between "Adventure Time" and "Regular Show" was great.

So, the plot is that Ben, Garnet, Raven, and KO are fighting a villain named Strike. He has turned all the other Cartoon Network characters into stone. This really was an act of love. Even though they were just there for seconds, the creators of the episode wanted to make sure they had permission from every one of their creators to use them. This was originally going to be a full half hour, which honestly I think would have been even better. Looks like the new "Wreck-It Ralph" movie has something to compete with. ****

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