The planet, with a sea shaped like the number two, shot off into the sun and exploded violently three days later.

I figure they made it just before their planet exploded.

This was a prequel series, set on Melmac before the planet exploded.

Even if this planet exploded now, all you'd lose would be a few hours of data input.

He is actually seeking a way to make the entire planet explode.

Of what consequence, though our planet explode, if there is no character involved in the explosion?

They all make it out in time and the planet explodes with no one dead.

Finally, the Earth's core is breached, and the planet explodes violently.

If all Humanoids are killed, the entire planet explodes, leaving the player in empty space.

Some of the Brood also manage to escape before the planet explodes.