Wait, did that planet just explode?
259 6.1 6.71. 2010: The Year We Make Contact (1984)
In this 2001: A Space Odyssey sequel the powers of a mysterious black Monolith are used to make Jupiter collapse and turn into a sun.
49 6 5.22. Battle Beyond the Stars (1980)
This Roger Corman-produced film I have barely heard of but according to Wikipedia a Stellar Converter used in this film can heat a planet's core "causing a delayed explosion where [the planet] incinerates from the inside/out".
304 3 03. Battlefield Earth (2000)
Aliens, such as John Travolta, from the planet Psychlo have managed to conquer Earth, but in the end of the film a human resistance group is able to teleport a nuclear bomb to Psychlo, which – thanks to its interesting atmosphere – explodes.
34 6.4 7.14. Dragon Ball Z: Cooler's Revenge (1991)
I haven't followed the Dragon Ball franchise but nevertheless am aware of that blowing things up is nothing special in this universe. The 5th DBZ is spectacular enough to be started with an explosion of a main charcater's home planet.
35 6.7 7.25. Dragon Ball Z: Broly – The Legendary Super... (1993)
After couple of sequels things really started to get out of control. The 8th DBZ movie begins with an annihilation of an entire galaxy. I guess that deserves some sort of honorary nomination. Thanks to Pumpkinate for the tip :)
1118 5.7 6.46. Final Fantasy: The Spirits Within (2001)
Earth is haunted by ghost-like creatures, which – as we surprisingly find out – were born when a planet blew up.
2488 6.5 6.77. The Hitchhiker's Guide to the Galaxy (2005)
Earth is demolished to make way for a hyperspace bypass. If you want to know more, read the book by Douglas Adams. The big-screen adaption is funny, but the book is hysterical.
3967 5.9 5.98. Men in Black II (2002)
A CGI bug (later Lara Flynn Boyle) wants to tell the audience who's the villian of the movie, so when travelling across the galaxy she destroys several planets in different ways – during the mere opening credits sequence!
0 10 6.19. Mercano the Martian (2002)
I have no idea what happens in this film, but according to TvTropes in the end "the Earth explodes because the characters cut the wrong wire of the remote controlling all of the world's computers, that were turned into bombs".
247 5.6 5.810. Soldier (1998)
Kurt Russell is one cool guy. A wimpy Colonel needing a spectacular end kaboom can't stand this fact and orders destruction of the waste disposal planet Russell is on. (Russell can't naturally be killed this easily.)
512 6.6 6.511. Star Trek III: The Search for Spock (1984)
In the awesomeness that is Star Trek II: The Wrath of Khan one of the subplots is a mysterious Genesis device. When ignited, it can create life on a dead planet. Unfortunately, the whole thing is very unstable, and the new planet collapses in few weeks. Because William Shatner is awesome, he fights a Klingon commander (played by Christopher Lloyd) on the planet when it's effing collapsing.
545 6.3 6.512. Star Trek: Generations (1994)
Malcom McDowell is a man who will stop at nothing to reach his goal - a one-dimensional cliché in Star Trek films. In the 7th film of the franchise obession of the villian is so powerful that he sacrifices entire star systems to gain what he wants. He blows up two suns, with a single missile each. The missiles contain something called trilithium, which causes the nuclear reactions within the star to cease. This creates a shockwave capable of destroying planets. Though two suns are bombed, we see only one planet being ripped apaart by the shockwave.
2248 7.7 813. Star Trek (2009)
In a JJ Abrams-helmed Trek film we're introduced an alternate timeline of the classic franchise. Vulcans couldn't stop the destruction of the planet Romulus and the surviving timetravelling Romulans are pissed off. They drill a hole into planet Vulcan's core, launch there something called red matter which creates a black hole. Vulcan collapses inside itself.
4911 8 8.814. Star Wars: Episode IV - A New Hope (1977)
The evil Empire officers threaten to blow up an innocent planet called Alderaan by Death Star, unless Princess Leia provides them with some information. Leia gives up but Alderaan is blown up anyway. Why? Because the Empire is evil, of course.
93 4.5 4.415. Starship Troopers 3: Marauder (2008)
Mankind has been fighting space bugs for an entire sci-fi trilogy, and now they want to get rid off a bug planet called OM-1. It's blown up with a planet killer called Q-Bomb.
1438 6.9 7.316. Superman (1978)
The Man of Steel's home planet gets destroyed when a sun turns into a supernova and its surroundings become an unhealthy place to live in. Also seen in Superman Returns.
634 6.2 6.517. Titan A.E. (2000)
Energy creatures called the Drej find mankind a threat so they make Earth explode with a death ray of some sorts that is hired from their mothership.
250 7 7.118. Transformers: The Movie (1986)
In this feature film long toy commercial an old line of toys is wiped off to introduce a new one. In this process an important assitance is a ridiculously big Unicron, voiced by Orson Welles in the last movie in which he contributed. In the very opening sequence his character wolfs down an entire robot planet, just to feed himself, I suppose.
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