“Thor: Ragnarok” (*** out of four) was a nicely done third entry in the Marvel comic series showing Thor (Chris Helmsworth) and Loki (Tom Hiddleston) who find themselves imprisoned in a gladiatoral arena where they are pitted against the Hulk (Mark Ruffalo) but soon find they all must join forces again to thwart the destructive force of Hela (Cate Blanchett) before she eradicates Asgardian civilization. Full of the requisite amount of psychedelic visual effects and large-scale action scenes and Helmsworth is first-rate again. Starts to lose its momentum towards the end and goes on too long but revs up again for a spectacular finish. As usual, there are many other Marvel characters (Dr. Strange, Black Widow) who pop up.