Sure the guy is standing with his hands in his pockets in the part 3 video. Don't judge the book by it's cover or let the 1983 attire puzzle you. He's the same dude! Our friend Mr Spock!
Leonard Nimoy aka Mr spock is the coolest alien in the universe and he's donned the starfleet uniform on national tv, on his own spaceship Enterprise NCC-1701 with Kirk, Scotty, McCoy, Uhura, Checkov and Sulu. So there! scoff not! Theres sweet Star Trek stuff to be had from these playback vids. Godbless Mr Spock! and Leonard Nimoy of course. He's the real dude.
"There is of course a catch that I'm sure all Star Trek fans have realised. In science fiction is death the final chapter of life or just the beginning of another story" Leonard Nimoy.