Thor: The Dark World (2014)

Thor: The Dark World is a 2014 superhero film part of the Marvel Film Universe franchise.

Plot
Thor has returned to Asgard and with the help of Sif and the Warriors Three have fought off several threats in the Nine Realms. An evil dark elf Malekith is awakened from hibernation and plans to reclaim his weapon the Aether and strike force upon the Nine Realms.

Jane Foster on Earth is infected with the Aether after accidentally finding it's hiding spot. Thor locates her and brings her to Asgard where Odin tells them that the Aether is really another Infinity Stone, the Reality Stone, that Malekith turned into the Aether long ago. Odin's father Bor lead a battle on the Dark Elves which forced them into hibernation as well as hid the Aether. With the Convergence aligning, Malekith leads his Dark Elves into battle on Asgard and successfuly takes the Aether, while also killing Thor's mother Frigga.

This leads Thor to recruit his prisoner brother Loki to join him in his battle against Malekith. Upon arriving on their home of Svartelfheim, Loki seemingly betrays Thor by showing his alliance with Malekith. Malekith instead kills Loki and leaves him for dead.

Malekith then infuses himself with the Aether and leads the Dark Elves into battle around the Nine Realms due to the Convergence. Thor follows him and eventually defeats him, taking the Aether out of him and killing him. He then tells Odin afterwards about Loki's death and bravery on the field, who is revealed to be Loki in disguise as Odin.

Volstagg and Sif then take the Aether to The Collector for safe keeping as they already have one Infinity Stone, the Tesseract, on Asgard, and they don't want another one in the same location.

Cast
Chris Hemsworth as Thor

Natalie Portman as Jane Foster

Tom Hiddleston as Loki

Christopher Eccleston as Malekith

Rene Russo as Friga

Ray Stevenson as Volstagg

Zachary Levi as Fandral

Jaimie Alexander as Sif

Kat Dennings as Darcy Lewis

Tadanobu Asano as Hogun

Stellan Skarsgard as Erik Selvig

Anthony Hopkins as Odin

Benicio Del Toro as Tannelar Tivan/The Collector (uncredited)

Chris Evans as Steve Rogers/Captain America (uncredited)