In an abandoned warehouse:

'You're going down, Radioactive.' The source of the voice was from someone in a bulky purple and blue Ultralink suit, who sped towards a bald man wearing a cockroach necklace and a gas mask with a radiation tattoo on his chest.
The man known as "Radioactive" was about to run, holding canisters of chemicals, 'Thanks for the idea, Roachy,' He spilled one of the canisters to where the Ultralink man was speeding to.

'You thinking what I'm thinking, bro?'
A male voice in his head responded, 'Oh, yeah.'

Together, they shouted their battle cry, 'FORM HYBRID: Hazmat, Speed!'
His belt lit up, blue circles and purple squished triangles flew to the guy. He was, soon, running in a hazmat suit.
'Hey, Radio!' Radioactive looked behind him. Before he could react, he got a punch in the face, which caused him to fly into a wall.
'Curse you, Guy Fusion.' He said in a weak voice.

A blue and purple Ultralink with a circular head and a purple eye came off of Guy Fusion's belt. 'Take that, Lame-ioactive.'

Suddenly, a white portal opened and sucked the screaming Radioactive in. Guy Fusion was being sucked in too, 'Fusion, link with me, hurry!'
Fusion stretched his arms wide out, before they yelled, 'FORM HYBRID: Flight, Strength!'
Unfortunately, the vacuum was too strong for them to get away. And so, they were in the portal.

It soon disappeared after they went in.

At a park:

'ENERGISE!' A teenage girl in red and pink roared.
A voice which sounded like a robotic female adult did the similar thing, 'WEAPONISE!'
A four-armed pink Ultralink with a red eye made an X-shape out of itself and flew onto the girl's back.
They said one final thing together, 'Arm-Cannons!'

Reddish, pinkish squares were magnetised to her forearms, then revealed the weaponry she requested on her hands.
Energy whirred from the cannons She aimed at a muscular man in ripped clothing, who had yellow crystals for teeth, hair and claws.
'Your head is mine, Creature.' An energy bullet launched out of her right cannon, but Creature literally "dodged the bullet".
'Wrong, Skye Titan. Your head is mine!' He became a lion. He roared, then lashed at her.
She went through the sequence again,
Skye: 'ENERGISE!'
Titan: 'WEAPONISE!'
Skye and Titan: 'Boxing Gloves!'

One hit in the stomach, followed by an upper-cut. Creature was defeated.

A white portal, like the one in the warehouse, opened up. It vacuumed Creature in, who was unconscious.
Skye Titan tried to run from it, but the suction from the portal made her trip and pulled her in.

In an empty space station:

A man in black and silver with a black cape and hood had an Ultralink on his face. The Ultralink he was wearing as a mask had a white eye.

'Darkness shall REIGN.' He said in a calm, low voice. Grey dust-like particles covered him from head to toe. Then, they dissolved, revealing a big, bulky figure wearing a hood and a cape.

He threw punches at four monsters. A grey rock one, fire type, water and air with a cyan light on each of their chests.
The four of them became one, 'You think you can stop us, Sir Dark?' the monster laughed, 'Once we have this place's Hyper-Cannon online, your planet will forever be ours.'

Sir Dark knew he couldn't let it happen. He knew the cannon needed one piece of material to make it work, 'Tell me Matirior, which of your powers will be the ammo?'
The beast ignited, 'I, Inferno Matirior, will set Earth on fire.'
They liquified, 'No, it will be Tsunami Matirior, who will flood the world.'
Matirior turned grey, 'This will be my planet, Landslide's planet.'
One more change to the creature, 'I want the Earth to fall, as I, Tornado Matirior, will use my power instead of those pathetic Matiriors.'

Too bad for him, the others heard him and made the four-brain Matirior fight itself.

The man in black and silver decided to finish their self-beating, 'Darkness shall SPREAD.'
Copies of the bulky man grabbed them. They were about to throw them out the airlock, when another white portal opened. It gave him the idea of throw them in the portal instead.

The clones disappeared, he clapped the dust off his hands as he was about to walk back to his ship.
But he was being pulled in, as well.

'Darkness shall RISE.'
He tried to fly his way out, but his ship hit him, propelling him into the portal.

At a research lab in the desert:

A green and white two-armed Ultralink with C.Y.T.R.O's face and two men in green and white walked to a holding cell. One of the men was in an Ultralink suit who also had the C.Y.T.R.O mask. In that cell, was an orange six-armed Ultralink in a sphere.
'Tell me, here are the rest of your kind hiding this time?'
The little alien only scoffed, 'It doesn't matter, I know what you're trying to do. Without us, you wouldn't be able to create your own Ultralink to help your friend's condition.'

He swatted the sphere to the wall, 'Actually, our Ultralink is perfect now, we just want to upgrade it. Now you will tell me where they are or I will-' He was interrupted by an explosion from one of the other cells.

A red and black two-armed Ultralink flew out of the cell. The two men ran to see who escaped. The green and white Ultralink man finally spoke, 'Activate: Rocket Mode'
The green Ultralink formed an N before latching onto his chest.
The escaped Ultralink flew to a morgue, searching through the files and cabinets. It found the body it was looking for.

When the green person in Rocket Mode found the prisoner, it had already linked on the body's chest.
'Now I'm ready to fight, Project N.'
Project N scoffed 'You're going back in that cell, Psycho.'

They crashed through walls. Their battle was fierce, but it ended in one of the research room.
'Activate: Capture Mode' He outstretched his hand to the linked alien and ripped it off of the body.

Suddenly, a portal opened directly in front of them, which caused them to be taken through.

The four of them, each from other different, alternate worlds/ universes/ dimensions/ whatever.

Where they will go, is a mystery. (Actually, not really, we all know where they'll go)