The Other reports the failed attack on Earth to his master. The film does not name him; Kevin Feige confirmed it was Thanos.
Thor kills the present-day Thanos early in the film. A 2014 Thanos then follows the Avengers to the present and is wiped out by Tony in the final battle.
Thanos was teased in a few seconds in 2012 and was not defeated until 2019.