Board Thread:Tapped Out Help/@comment-186.154.201.131-20150320215046/@comment-26143371-20150321133454

Sidekick Milhouse is not part of the Superheroes Event 2015. He was available during the Valentine's Day 2015 Event.

At the moment there is no way you can get him. However he might be re-released as a premium item at some point in the future.