♪ We're on our way to where the doggies play ♪

♪ The mystery will be solved today ♪

♪ On Elmo and Tango's Mysterious Mysteries ♪

(Tango barking)

(Elmo giggling)

- Okay, now Tango, stay.

And good girl, Tango.

Oh, hi.

Today, Elmo is teaching Tango some new tricks.

- Special (grunting) delivery!

It is I, your cute and helpful delivery monster, Grover.

I am making special deliveries with my wobbly delivery cart.

Woo!

I am helping our community by delivering mailing packages

to people and pups.

Now let me just check the tag.

Ah, I have a chew toy for Tango.

(Tango barking) (chew toy squeaking)

Oh, and this tag says this card is for Elmo.

- Oh wow, it's a card from Elmo's nana.

Ah, thanks delivery monster Grover.

- Do not mention it.

And finally, I have this nice round wheel for...

Let me see, there is no tag.

That means I do not know who to deliver this wheel to!

- I wheel with no tag?

Tango, this sounds like a mystery!

(playful music)

♪ Mystery, it's so mysterious ♪

♪ Mystery wheel? ♪

♪ That's serious ♪

♪ It's a problem we can solve together ♪

♪ We're Elmo and Tango ♪

♪ We'll be friends forever ♪

Don't worry, Grover, Elmo and Tango will solve the mystery

and find out who the wheel is for.

(Tango barking)

- Ruff ruff, that means thank you.

- Come on, Tango.

Let's investigate.

(Tango barking)

- Hey, Cookie Monster's treat cart.

(Cookie Monster chewing)

And look, it has wheels.

Ooh, Elmo wonders.

What if the wheel is for cookie monsters cart?

Come on, Tango, let's try looking.

- Right behind you!

- Hi, Cookie Monster.

- Hello Elmo.

- Does your cart need a new wheel?

- Yes, this wheel?

- New wheel?

Me no think so.

- Ah, yeah.

The wheel is smarter than this wheel on the cart.

It's not for the cart.

- Are you sure that's not cookie?

'Cause me always need new cookie.

- Sorry, Cookie Monster.

This wheel is for somebody else.

- Bye-bye.

- Ah, who are we supposed to deliver this wheel to now?

- Let's keep looking.

We've got to solve the mystery.

(Tango barking)

Hey, it's Abby,

and her wheelbarrow has a wheel.

Oh, Elmo wonders.

What if the wheel is for Abby's wheelbarrow?

Come on, Tango, let's try looking.

Hi Abby.

Does your wheelbarrow need a new wheel?

- Please say yes.

- A new wheel?

I don't think so.

Oh yeah, the wheel is bigger than the wheel

and the wheelbarrow.

It's not for the wheelbarrow.

- Oh, good luck.

I hope you find who it belongs to.

- This mystery is very mysterious,

but Elmo and Tango can't give up.

We have to figure out who the wheel belongs to.

(Tango barking)

- It is okay, Elmo and Tango.

This delivery monster will just keep delivering

and pushing this wobbly old cart around forever.

(Tango barking)

- What is it, Tango?

(Tango barking)

Wait a minute, Grover's cart has wheels,

and Grover's been having trouble pushing it.

So Elmo wonders, what if the wheel is for Grover's cart?

Let's try looking.

Hey, this wheel is the same size as Grover's wheel.

And look, the wheel is flat.

- It is?

Let me just put that new wheel on there.

It is a perfect fit!

- Hurray!

Elmo and Tango solved the mystery!

♪ Shake your tail and stomp your feet ♪

♪ Tango, here's a doggie treat ♪

- Whee!

- Bye-bye, see you next time.