Samurai Jack is a man of adventure. The entire series is built around Jack exploring a land he doesn't know and stumbling upon all sorts of crazy adventures, creatures, and enemies in his quest to defeat Aku. The sixth episode of the latest - and reportedly last - season currently airing on Adult Swim featured lots of callbacks not just to Jack seasons past, but plenty of easter eggs that animation fans had fun searching for.

Creator Genndy Tartakovsky has been working in animation for nearly 25 years, so there's a lifetime of animation history banging around in his head. All five seasons of Samurai Jack and chock full of homages and nods to animation and films past, and I dug around to find twelve of the best that you might not know about.   

1. The Big Dog from 2 Stupid Dogs (From "The Samurai Called Jack")

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In the series' second episode, Jack stumbles across a group of dog archeologists, one of whom looks an awful lot like the Big Dog from old Hanna-Barbera cartoon 2 Stupid Dogs.
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Tartakovsky began his career working on 2 Stupid Dogs, one of the last Hanna-Barbera cartoons produced before being absorbed by Warner Bros. Animation in 2001, so it's no surprise that he paid homage here. 

2. Alice In Wonderland (From "Jack Is Naked")  

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Jack has to find his missing robe in this episode and is taken through the story of Alice In Wonderland in the process. He chases a white rabbit, changes into Alice's iconic outfit, and even deals with someone who looks an awful lot like the Queen of Hearts.

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3. Chewbacca (From "Jack vs. Mad Jack")

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Bounty hunters are always on Jack's tail throughout the series, but this little guy looks kinda familiar, huh?

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4. Huntor from Dexter's Laboratory (From "Jack vs Mad Jack") 

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Huntor was originally a character from an episode of Dexter's Laboratory, the first show Tartakovsky worked on for Cartoon Network, and yet another future bounty hunter bares a striking resemblance to this crazy obscure character.Even their hats are bent the same way. 
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5. Greedo (From "Scotsman Saves Jack Part 1")

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Yet another bounty hunter out there who crossed one of Jack's friends.Between the solid color eyes, the tube mouth, and the speckled face, how could this not be a hat tip to Greedo from Star Wars?

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6. Quick Draw McGraw (From "The Good, The Bad, & The Beautiful") 

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Jack spends this episode on a train outrunning a bounty hunter duo, but not before we're treated to a flash of Quick Draw McGraw and Baba Looey. These two are mainstays from Hanna-Barbera's early days that recieved a few then-modern updates, future train riding being one of them.  
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7. My Neighbor Totoro (From "Jack and The Creature")undefined

Jack is followed around by a huge creature who won't stop begging for berries in the forest. The creature bares more than a passing resemblance to Totoro from Hayao Miyazaki's classic My Neighbor Totoro. In fact, the time-travelling crystal - The Crystal of Cagliostro - that Jack spends the episode looking for looks very much like the levitation crystal from Miyazaki's Castle In The Sky. It's even named after The Castle of Cagliostro, one of the first films Miyazaki ever worked on.
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8. Lobo (From "Jack vs Demongo The Soul Collector")

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It's a blink and you'll miss it shot, but look at this grey-skinned biker and tell me that you don't get flashes of DC's craziest bounty hunter Lobo. 
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9. Popeye (From "Episode XCVII) 

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The one-eyed sailor man gets a robotic shout out as a patron at a bar who lost his eye to Jack in a fight. Tartakovsky was originally attached to a Popeye movie with Sony Animation that was eventually canned, so this might be the closest we'll get to a proper showing.

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10. Astro The Dog from The Jetsons (From "Episode XCVII")  

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Yet another old Hanna-Barbera reference. The Jetsons' peppy dog Astro showed up in the new season as a bruiser, complete with pointy ears, his green collar, and a not-so-peppy snarl.

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11. Brak (From "Episode XCVII")

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This is a forest creature that guided Jack's frenemy Ashi toward a missing Jack. It's hard to look at this silhouette and not imagine Space Ghost's Brak.
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12. Dexter's Laboratory (From "Episode XCVIII")

Tartakovsky's old boy Dexter used to start his show by pressing a button to turn his sign on, and last week, Jack pulled from the same book to activate the death Roomba. Shout out to Marcus Koffie for noticing this neat easter egg!