Completing all of the challenges for this week unlocks another loading screen:

Blockbuster Season 4 Week 2 Loading Screen

If you look in the background, there are 4 coordinates on the wall, A4, B4, A3, and B3.

Season 4 week 2 blockbuster hidden battle star co-ordinatesHere is the location of the hidden Battlestar, which is between the four co-ordinates, posted by Reddit user Bfor45:

Blockbuster Week 2 Loading Screen Location B4

Simply interact with the star to receive a whole Battle Tier!

If you haven’t found the hidden Battle Star for Week 1, you can find the location below:

Hidden Battle Star for Completing Blockbuster Challenge