Kirk is stranded on Delta Vega (the ice planet) by Spock (after getting on Spock's nerves), where after facing the big red slobbering monster, he meets up with Spock Prime (Nimoy).
Spock explains that he's from the Future, performs some necessary information exchange and exposition, then introduces Scotty, who was stranded on Delta Vega for vaporizing the Admiral's Beagle.
Scotty is accompanied by a small creature, some kind of assistant possibly.
Spock explains to Kirk that he has to take command using Starfleet regulations on the grounds that Spock (Quinto) is emotionally unstable, then go from there to stop Nero from doing something bad.
Spock gives Scotty his own formula from the future for Inter-warp (long distance) beaming, and this gets Kirk and Scotty back to the Enterprise.
Chief Engineer Olson was killed earlier, when they did the Space-diving operation to Vulcan to stop Narada's drill beam from finishing up, and thus prevent the Red Matter being planted in the guts of Vulcan to create a Black Hole.
Olson is killed because his chute fails to open in time.
Of course, Olson is wearing red
