I have built the gateway but was not prompted to build the Batmobile.

In order to have the best experience while playing LEGO® Dimensions including resolving the issue that you have described, you will be required to install the most recent content update to your game console. 

To install all recommended content updates, your game console must be connected to the Internet:

1.    Insert the LEGO® Dimensions game disc into your game console.
2.    As the game starts, you will be notified if any updates are available.
3.    Follow any onscreen prompts to initiate the installation.
4.    Select your storage device, if prompted.

Once the update installation is complete, you will be returned automatically to the game’s main menu. 

*If you are unable to download the content updates at this time, please follow the steps below which should provide you with the prompts to build the Batmobile.

1.    Close re-launch the LEGO® Dimensions game.
2.    Create a new game, you can save the game in the same save file that was used previously.
3.    Continue through the game as directed.
4.    After the opening video scenes, please do not remove Batman from the LEGO® Toy Pad.  You can move Batman around the different sections of the Toy Pad to complete the first two light puzzles, but do not remove him after these puzzles.
5.    Once you have built the vehicle ramp, if you are not already using Batman, please switch to him and you will be prompted to build the Batmobile.