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Description
Alright, my friends! Time for a little game! Can you find the connection between these four characters?

1. The Doctor (Dr. Who)
2. The Pirate Captain (Pirates! Band of Misfits)
3. Milo Murpy (Milo Murphy's Law)
4. Mary Poppins (Mary Poppins)

Venture a guess before looking at the other comments. No peeking, now.

A hint *Rover could be in this lineup

(EDIT)
Thank you all so much for your guesses! There were some really interesting ones. Several of you got it right, though.
The answer is:
They all own something that is bigger on the inside.

1. The Doctor owns the Tardis, which, on the outside is just a phone box but on the inside holds a library, a swimming pool, endless hallways....oh, and a dying sun!!!
2. The Pirate Captain's beard seems to have some sort of spatial anomoly inside it as he can hold an umbrella, a dodo bird, a water bottle dressed as a dodo bird all inside it.
3. Milo Murphy's backpack is only one of the anomolies surrounding the kid. He has everything he could possibly need in any disaster contained in that little pack of his......including a ships anchor about ten times the size of himself.
4. Mary Poppins carpet bag is clearly bigger on the inside when we see her pull out a six foot floor lamp, a giant mirror and a house plant from inside!

Description
Alright, my friends! Time for a little game! Can you find the connection between these four characters?

1. The Doctor (Dr. Who)
2. The Pirate Captain (Pirates! Band of Misfits)
3. Milo Murpy (Milo Murphy's Law)
4. Mary Poppins (Mary Poppins)

Venture a guess before looking at the other comments. No peeking, now.

A hint *Rover could be in this lineup

(EDIT)
Thank you all so much for your guesses! There were some really interesting ones. Several of you got it right, though.
The answer is:
They all own something that is bigger on the inside.

1. The Doctor owns the Tardis, which, on the outside is just a phone box but on the inside holds a library, a swimming pool, endless hallways....oh, and a dying sun!!!
2. The Pirate Captain's beard seems to have some sort of spatial anomoly inside it as he can hold an umbrella, a dodo bird, a water bottle dressed as a dodo bird all inside it.
3. Milo Murphy's backpack is only one of the anomolies surrounding the kid. He has everything he could possibly need in any disaster contained in that little pack of his......including a ships anchor about ten times the size of himself.
4. Mary Poppins carpet bag is clearly bigger on the inside when we see her pull out a six foot floor lamp, a giant mirror and a house plant from inside!