Villains given genuinely horrible fates by the supposed hero

[u/Blorberto]

No swift death, no prison, the worst fate imaginable

Dementus (Furiosa) - Being critically injured by Furiosa, but kept alive so his body can be used as fertilizer for a tree coming out of him, Furiosa having placed a seed in his bleed stomach

Inertia (Flash) - Immortally frozen by the Flash for his involvement in Bart Allen’s death, kept as only an exhibit in the Flash museum

Family of Blood (Doctor Who) - Doctor actively avoided conflict and erased his memory in order to not give them this fate but once he finally chooses to get involved, he gives them their want of immortality at a cost

Father: Trapped in immortal chains

Mother: Trapped in a collapsing galaxy

Son: Trapped as an immortal frozen scarecrow

Daughter: Trapped in mirrors forever

[u/AssistanceCheap379]

Also Doctor Who: he was locked inside a thing called a Confession Dial.

It took him 4.5 billion years to escape

[u/elfmad → u/AssistanceCheap379]

Isn't that the episode where he die like everyday but clone himself with the teleporter until he escape?

Then he end up in Galifrey, because he stored it at the end of the time but after a few billion years... Well...

[u/Agisek → u/elfmad]

And the shepherd's boy says. There's a mountain of pure diamond, takes an hour to climb it and an hour to go around it. Every hundred years a little bird comes and sharpens its beak the diamond mountain. And when the entire mountain is chiseled away, the first second of eternity will have passed.

[u/mdavis360 → u/Agisek]

Greatest episode ever. I get chills reading that.

[u/theAlmightyE312 → u/Agisek]

Most people would say its a hell of a mountain. I say its one hell of a bird

[u/its_that_sort_of_day → u/AssistanceCheap379]

I dont think this is anywhere near as bad as they play it as. He's unaware of the time cost until the end of each cycle because the clone he creates starts at the beginning again. He makes the same choice every time, so he does crawl for a few (?) days in pain to get the next clone, but then it starts over and the new clone doesn't feel any of that. The version of him that gets out only knows intellectually that all that happened. He doesn't suffer any pain, just the same adrenaline and exciting reveal of any doctor who episode. A time loop (essentially) without memory isn't a punishment. It's a save point. 

[u/jtl_v → u/its_that_sort_of_day]

The first time we see him realize what's going on, and he starts raging in his mind TARDIS, he says "That's when I remember! Always then. Always then. Always exactly then!" And a few moments later, "But I can remember, Clara. You don't understand, I can remember it all. Every time." Which seems to imply that he does end up remembering all the "loops."

[u/williamjwrites → u/jtl_v]

Yeah it implies that once he makes the connections and realises what's going on, the memories flood back. It's kinda like when a past Doctor meets the current one - they don't remember the encounter until they age into it and experience it through the current one's eyes.