In the year 3000, when the power plant's radiation has decayed.

The next user is an hero :^)

Indeed I am.

 

The next user is stuck inside a giant oven. He's being cooked into cookies!

I happily ate the cookies, and myself :D

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The next user is being cookied into cooked.

I find a way out of being cookied in the cookie machine

The next user is falling from the sky at terminal velocity onto concrete, naked. (no equipment)

Again, I fall on Hopian.

 

The next user was Hopian

I spot you before you land and step out of the way.

The next user must figure out a way to save @Lord_Bowserinator from his falling death without dying themself or they will be killed themself.

Fortunately, I have this gravity manipulator thingy. I simply reduce the local gravity to the same level that is found on Pluto. As a result, terminal velocity is now below the speed needed to be lethal.

 

I spawned a black hole inside the next user's body, with the mass of Earth in it. The black hole will not evaporate anytime soon, you have no way of getting it out of you, and you are a normal human. Have fun getting ripped apart by tidal forces and being crushed into the singularity.

You don't know how to spawn a black hole and if you are able to do that, you will also get ripped apart.

 

The next user gets a F- in every subject/class.

I switch my name with another classmate, now they shall have all the Fs!

 

The next user wakes up in a dark room, tied to a table, with a mad scientist in front of him that is wielding a chainsaw.

He wields the chainsaw, saws the door in half and lets me out.
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The next user is inside a space ship that is not protected by radiation (because it was built by a retard) that is dangerously close to a pulsar's range of radiation and is about to fall into it. You are not a super hero with no super heroes and you are alone in the space ship because everybody died and you're next!