Land of Apocalypse and Isolation

I see your “Rocky swears like a sailor but only in pitches humans can’t hear/refuses to teach Grace what those words mean” and raise you “Rocky swears like a sailor and now has to explain to Grace that ‘bad bad bad’ isn’t actually a sequence you play on your Eridian speech piano in polite company.”

Eridian government representative: Greetings Rocky, Saviour of Erid, and Grace, Saviour from Beyond the Stars. We are pleased to welcome you home.

one of the funniest conversations I ever had with my ex was when they were still getting used to Celsius and asked me "what's 20 degrees?" and instead of converting it, I said "it's the highest your dad will ever let you set the thermostat and when you say you're cold he tells you to put on another sweater, we're not made of money" and they went "oh, 68"

Okay but imagine being the team of Eridian scientists tasked with keeping Erid's Only Human alive for as long as possible while the whole planet's environment is literally trying to kill him. And then Rocky shows up and is like:

To celebrate Erid getting their sun back on track, Grace asks for some alcohol. There's a small amount left from the Hail Mary and Rocky offers to take it to the science Eridians to see if they can synthesise more.

Grace is like one of those extremely finicky tropical fish who instantly die if not kept in extremely specific conditions.