Given scene/plot descriptions from movies or TV shows, and given a specific question about the scene, summarize the question into a title

As far as I can tell, Phantasm 1, 3, and 4 are only available on DVD. Is there a reason why this is so? I can't tell if the rights are owned by a different company, but I don't believe this to be the case.   And the second movie is hardly such a classic that it would be included in the Criterion Collection or anything like that.   So what gives?
Why is Phantasm II available on Bluray while the other movies in this series are not?

During the course of the Avengers, you see Mr Banner talk about his alter ego as just another entity inside of himself. Afraid, reluctant and very much un-willing to let him out, even if it means his escape from being captured by S.H.I.E.L.D. Citing Hulk's violence, lack of self-control, and raw power that would come of unleashing such a creature.  However, during the argument on the plane as well as for the final battle, Banner is willing, and eventually does let the beast lose, seemingly without knowledge as to whether or not he can control him properly.  Why does Banner choose to release the Hulk and where does he get the confidence he needs to be sure that he can point the indestructible beast towards the enemy, and not towards the Avengers?
Why does Banner finally allow the Hulk to come out?

In the pilot movie "The Six Million Dollar Man" (1973) which preceded the TV series, Steve Austin was a "civilian member" of NASA who had walked on the moon, which justified his role as a test pilot. It was only in the second TV movie, "Wine, Women, and War" that he was changed to have the rank of Colonel. I have not read the Martin Caidin novels, but evidently he held the military rank and background in those.  Is there any evidence in writings about the pilot regarding what scenarios would be possible in future TV movies, shows (if they were already pitching it as a series) if he didn't have the military background? It seems as though they deemed it important in the initial pilot movie that Steve Austin was well-known as an astronaut, but was the cultural backdrop of the end of the Vietnam war part of their initial decision to shed the military connection?

What plot points/cultural significance would making Steve Austin a civilian member of NASA have served?