The four Martians could be stranded on Mars.
They trust one or two of the robot / androids - but not completely.
One of them left the door open to the habitat - deliberately.
A plan is hatched in the Alamo - but with all electronics of any kind out of their reach, the four martians have many problems to overcome.
The first is how to fight wo robot / androids, granted, they have found ways of hiding from the robots electronically, or they would have been dead within seconds; their thin Marsuits would have been quickly compromised.
Then there came the question of the escape from Mars - and how do you navigate without computers?
They have mixed feelings when they find that one of the robot / androids is following the on their journey back home. He claims to be friendly, and would like to dock to help them. Would you let that happen? but how can they stop him?
On Earth, half of Gran Canaria has slipped into the Atlantic - sending a Tsunami that wipes out the East coast of America, including most of NASA.
There are elements who are still helping the returning astronauts, but there are also elements who are not.