WandaVision

[BRC]

So, what the heck was the plan with that Mars rover? How, exactly, would it have helped in any way even if it had worked? Why did they think it would? They already knew anything that passes the barrier is transformed. Especially modern tech. Why try it with the most space-agy tech they could find? And what would have been accomplished by having a moon rover inside the anomaly?

The idea was to be able to protect Monica as she went in, without herself getting rewritten, since she'd already gone through the barrier twice.

It was "here is how to have somebody inside the anomaly who isn't rewritten into a sitcom character under Wanda's control"
It was, theoretically, sufficiently resistant to the Hex field to avoid being transformed (they were wrong).