Dark Heart

The Millennial comet seems to be in a collision course with the Earth, Guile and his team must track what is causing it to go off course and destroy it before it is too late.

Guile gets off a bus and heads into a small bar, where he waits for the next bus to Dallas. The TV is on and it shows a special report from Chun-Li.
 

Chun-Li's report explains about the Millennial comet, a comet which only appears once in a thousand years. Some other guy at the bar demands that the TV channel is changed to the football game, but Guile asks him to be quiet. The big guy doesn't take kindly to this and tries to punch him, but one Sonic Boom later and the guy is knocked against the cash machine, which displays this hilarious message. Guile leaves the bar as the bus arrives.

Escher is the guy driving the bus, and when Guile gets on he sets it to auto-drive. Escher informs Guile that the comet has been studied by NASA, and instead of passing the Earth, it is on a collision course. Something is pulling of off course, and the source seems to be in the Himalayas. Escher orders Guile to destroy whatever the source is. Guile decides to take Blanka, Ryu and Ken with him on this mission.
 

Meanwhile Ryu and Ken are in a fixed fight, which Ken is suppose to lose on purpose. However, Ken decides to knock his opponent out with a hurricane kick and win the fight. Later on The fight manager is angry that things did not go to plan and sets his thugs on Ryu and Ken, only for Guile to show up, Sonic Boom the thugs, and tell Ryu and Ken to follow him.

The missions begins later on, but as the team start to enter the mountains, Zangief and a few troops spot them. Zangief orders the charges to be detonated, which explode part of a mountain and cause an avalanche. Guile, Blanka and the two oxen survive, but Ryu and Ken are nowhere to be found.

Guile and Blanka search for Ryu and Ken but have no luck. Blanka tells Guile that the avalanche was not natural, as he could smell traces of explosives. The two walk onward and eventually see large temple, but suddenly several men with spears appear, followed by their master, Dhalsim. Blanka wants to make Dhalsim pay since it was him that mutated him, but Dhalsim avoids conflict and eventually calms Blanka down. Dhalsim leads them to the temple.

Meanwhile, Ryu and Ken have been captured and Bison is kind enough to explain his plan to them. Bison has taken over this complex and created a machine that greatly strengthens his magnetic chi energy, and he is using it to put the comet off course. He's going to crash the comet right into the Norad Defense HQ, and the comet will create such a crater that the entire Western USA will fall into the Pacific ocean. Bison only has to make one more adjustment to the comet and then no-one will be able to stop it.
 

Back at the temple, Dhalsim explains that he has turned his back on science and he and his students have now dedicated themselves to learning the power of the chi force. He tells Blanka that if there was anything he could do to change his mutation he would, and then explains that the comet was written down in ancient history as being a sign important in telling the things to come. Well, Guile sums that one up better than I can.
 

Back at Bison's base, he tells the now clamped down Ryu and Ken that when he uses his power to change the comet's direction one last time, a huge wave of energy will rush through this chamber and incinerate them. Back at Dhalsim's temple, Guile tells Dhalsim Bison's plan, and Dhalsim agrees that they must go and stop him. Zangief and a few troops arrive at the temple though and a fight begins.
 

Of course, given the fact that the bad guys are outnumbered by the good guys, this is a pretty short fight and all the bad guys do a runner. Guile orders everyone to follow them as they will lead them back to Bison's base.
 

As this is happening, Bison starts up the machine. In the chamber, the electric clamp things holding Ryu and Ken down suddenly fail and the two leap up into an emergency exit shaft just before the wave of energy rushes through. The energy is channelled through a satellite dish and hits the comet, changing it's direction. It will take just five minutes before it hits the Earth.
 

Guile and co. are attacking the guards outside of the base, Ryu and Ken appear and help out too. Once they are all defeated, they storm into the base and finds Bison.
 

Dhalsim starts to fight Bison, but eventually Bison gets away by blasting a whole in the roof and flying out. With just one minute left before the comet hits the Earth, Guile says they have to try and use Bison's machine to knock it off course. Dhalsim refuses to help at first due to him never wanting to use science again, but Blanka convinces him. With Guile ready, Dhalsim activates the machine...
 

... and the comet is deflected successfully. Later on, Dhalsim tells the Street Fighters that they will meet again, and then tells them to leave whilst he destroys Bison's machine so no-one else can ever use it again. As the Street Fighters leave and head up a mountain, they hear an explosion, and turn around to see Bison's base exploding, Dhalsim managed to destroy it.

I'm no astronomer here but when you see the comet being deflected thanks to Guile the moon looks way too big.