sacrifice to prevent mass death theme

A character does a self-sacrificial thing in order to save a large number of people from death.

Examples

In voy5x25 "Warhead" the eponymous warhead (a sentient bomb) decides to detonate to destroy a number of other bombs instead of letting them complete their missing, thereby saving countless innocent lives.

23 total · 4 choice · 6 major · 13 minor

StoryLevelMotivation
bbf1x19 choice Draal willingly merged with the planetary-scale machine to prevent the planet it was in from destroying itself and Babylon 5 with it. Delenn explained the important of making a self-sacrifice when she bid farewell to her mentor Draal.
bbf3x22 choice Sheridan jumped to his death in order to change a disastrous timeline
ldr2019e3x02 choice Torrin could have taken the easy route by giving into the giant man-eating crab monster's demand to be transported to a nearby populated island, where the crab monster and its brood would presumably feast on the local inhabitants. Instead, Torrin executed a plan, at great personal risk to himself, that culminated with the crab monster and its brood being fricasseed in shark oil.
tos1x20 choice Lazarus-A :: Lazarus-A
as1985e2x05 major Earl risked life-and-limb to prevent the vision he had seen in his dreams of a Boeing 787 crashing, coming to pass.
shortstory: The Comet Doom (1928) major In the end, Coburn and Hanley gave their lives to stop the cyborgs from completing their plan to whisk the Earth away out of the solar system and use it as a source of natural resources.
tas1x03 major Captain Kirk risked the Enterprise to save the colonists on Mantilles from being killed by a vast, planet-eating space cloud.
tz2002e1x35 major Dr. Paul Thorson killed everyone involved, and then himself, in order to prevent his "Gemini device" to be completed as he believed it would destroy the world.
voy5x25 major sentient alien missile blew it self up along with other 32 other sentient missiles to prevent them from hitting their targets
voy6x26 major Janeway went through hell and high waters to try and save the unimatrix zero Borg drones from being killed