Watch: 'WandaVision' mid-season trailer.

Disney+ have dropped a mid-season trailer for Marvel Studios' new hit show 'WandaVision', revealing a little more about the mystery behind the premise of the show. 

In an interview with TVLine, the star of the show, Elizabeth Olsen stated that there is an upcoming cameo that she is "very excited" about - with TVLine comparing it to the Luke Skywalker 'The Mandalorian' cameo. 

Check out the full trailer below...