TSFS - ok, not very epic except for getting Spock back
Not very epic? Saving Spock and preventing the Klingons from getting the Genesis device (in other words The Atomic Bomb) are pretty high stakes. Add the destruction of Enterprise, the death of David, the sacrifice of their careers, and the chaotic breaking up of the Genesis planet and you can see that Star Trek III is actually one of the most
epic films in the series.