>> ♪ Cyberchase ♪ ♪ We're moving ♪ ♪ We're beating Hacker at his game ♪ ♪ Don't tell me that he's trying to hack the Motherboard ♪ ♪ We'll get him every time ♪ ♪ Cosmic worlds, freaky places that we've seen ♪ ♪ We've got the power of one, two, three, four ♪ ♪ Running in the Cyberchase ♪ ♪ We'll meet him face-to-face ♪ ♪ We'll stick together all the time ♪ ♪ Adventures in cyberspace ♪ ♪ The chase is on ♪ ♪ Just wait ♪ ♪ And c-y-b-e-r chase!

♪ ♪♪ >> Toothbrush.

>> [ Laughs ] >> [ Laughs ] Ball.

Now where's my helmet?

Oh, here it is.

It must be dirty.

I can't see a thing.

Whoa.

>> Is this what you're looking for?

>> [ Gasps ] My helmet.

Now I can breathe underwater.

Thanks, Jackie.

>> Breathe underwater?

Where are you going in such a hurry?

>> Only the greatest site in all of cyberspace, Mermaidos.

>> Mermaidos?

>> I took some videos last time I was there.

Check it out.

Ah, Mermaidos, a beautiful cyber site with green trees and the coolest of cool waterfalls, but the best part is underwater.

Helmet on!

Yee-haw!

>> [ Gasping ] >> Wow!

>> Colorful fish... >> Whoa!

>> ...and, of course, Mermaidians.

This is my friend Eugene.

>> Hi, Didge.

>> We frolic with the fish.

>> We have picnics under the shady trees.

>> And we play fetch with Eugene's pet sculpin, Slimey.

Fetch, Slimey.

In Mermaidos, we have fun all day long.

Whoa!

>> Wow.

Mermaidos seems really cool.

>> It's the best.

Now, if you'll excuse me, I'm off to Mermaidos.

>> Adiós!

>> Bye, Didge.

>> Have fun!

>> [ Grunts ] Ah!

Goodbye!

♪♪ Yee-haw!

The only way to travel.

Hey, how come it's so cloudy down here?

Where's Eugene's house?

Ah, there it is.

♪♪ [ Tapping ] Oops.

Sorry, Ms. Snail.

>> Ah!

♪♪ [ Knocking ] >> Didge?

>> Eugene!

>> Boom!

Boom!

>> Hee hee hee!

>> So excited you're here.

What do you want to do?

>> Let's play fetch with Slimey.

Here, Slimey.

Slimey?

Where is Slimey?

>> I don't know, but I'm sure he'll be back soon.

Let's play tag.

>> Good idea.

Tag, you're it.

>> Woo-hoo!

>> [ Grunts ] What's going on with all these plants?

[ Grunting ] I don't remember them growing this big and wild.

[ Grunts ] A little help?

Aah!

>> Whoa!

♪♪ Oof!

>> Gather round.

Mayor Ethel Mermaid has an announcement.

>> ♪ Something is wrong with the waters of the Mermaidos 'cause all of the sculpin are gone ♪ [ All gasping ] >> What's wrong?

>> Wait, you mean it's not just Slimey?

>> ♪ To figure out this big problem, Mermaidos is going to need help ♪ >> Help?

Who can help?

♪♪ [ Door creaks ] ♪♪ >> Ah, a perfect day to relax in the sun.

>> Don't forget your sunscreen, boss.

>> I'll apply it.

>> No, I will.

>> No, me.

>> Me!

>> Me!

Me!

Me!

I told you!

Uh-oh.

>> You cretinous collection of cogs, look what you've done!

>> Sorry, boss.

We'll fix it.

[ Squeak ] [ Sproing! ]

>> Today is supposed to be all about relaxing.

Soon, all of Mermaidos will be my own personal hot tub.

Ha ha!

Ha ha ha ha ha!

[ Ominous music ] >> Ha ha ha ha ha ha!

>> Hee ha ha ha ha ha!

Now, in order for me to reach maximum relaxation, this water must be 100 cyber degrees.

Has it reached 100 cyber degrees yet?

>> Oh, yeah.

Must be.

Absolutely.

>> All righty then.

Ahh.

[ Gasps ] Cold, the water is too cold!

>> Sorry, boss.

We're on it!

♪♪ >> Just go and make the water hotter!

>> Yeah, much hotter!

>> You got it, boss, much hotter!

♪♪ [ Groans ] [ Thump ] >> Are you sure your friends can help?

>> Trust me.

The Cybersquad can figure out anything, and here they are now.

Inez, Jackie, Matt, say hello to Eugene.

>> Hey!

>> Hi!

>> Hey!

>> Okay, that's enough.

We've got a problem.

>> No kidding.

The water is a lot greener than it was in your video.

>> That's new.

The water is usually crystal clear.

>> ♪ And all of our sculpin are gone!

♪ >> Slimey, too.

>> Slimey?

>> The fish you saw in the video!

>> Oh, right.

>> It says here, sculpin are good indicators of a healthy Mermaidos ecosystem.

>> Ecosystem?

>> A community of living things and all the air and land and water around them.

They all share the same space.

>> That means if the sculpin left, something might be wrong with your ecosystem.

>> Is anything else different?

>> These plants are a lot bigger and wilder than I remember.

>> And the water feels a lot warmer than usual.

>> Huh.

What temperature is it supposed to be?

>> ♪ Seventy-six cyber degrees, always 76 ♪ >> I wonder what the temperature is now.

>> Allow me.

It's 85 cyber degrees.

>> ♪ Eighty-five?

♪ ♪ That's much too warm ♪ ♪ It needs to be 76 ♪ >> Note -- the normal temperature in Mermaidos is 76 cyber degrees.

Note -- Now it's 85, and the sculpin have left.

>> Okay, what else do we know?

Whoa.

>> We know it's really hard to pace underwater.

>> [ Chuckles ] Matt!

>> We also know that the plants are bigger, and the water is cloudy and warmer.

>> Could it mean that change in water temperature is causing all these problems?

>> Good question, Eugene!

>> Come on, Cybersquad.

Time to investigate!

♪♪ >> [ Laughs evilly ] Excellent, excellent.

All the trees are gone.

Yeah.

Now there's nothing to shade the water from the sun.

My enormous hot tub should be a perfect 100 cyber degrees in no time.

♪♪ Ah, ah.

What?

Still too cold!

Buzz, Delete!

>> We need to find out what's making the water warmer.

>> Maybe these fish know something?

>> Looks like they're leaving, too.

>> First Slimey, now the rest of the fish?

This is not good.

>> Temperature check!

>> On it!

Eighty-nine cyber degrees.

>> The temperature was 85, and now it's 89.

That's four degrees hotter.

Note -- At 89 degrees, the other fish are leaving.

>> ♪ The hotter is gets, the more polluted the water, so tell your merson and tell your merdaughter ♪ ♪ If the temperature gets to 100 degrees, we all must move ♪ ♪ We all must leave ♪ >> Leave Mermaidos?

>> But Mermaidos is my home!