Sirius

 is a(n) star/area in Plants vs. Zombies: Through The Stars. It's the first level of it.

Twist
It is so hot that you need Fire-proof Pots. Any plant on the fire will be melted in 10 seconds.

Plants

 * Fire-proof Pot (1-1)
 * Flaming Pea (1-2)
 * Flame Repeater (1-3)
 * Flame Bomb (1-4)
 * Flame Threepeater (1-5)
 * Flame Slower (1-6)
 * Flame Re-slower (1-7)
 * Flame Three-slower (1-8)

Zombie Note (on a Fire-proof Paper)
We want tu eet yur brainz and cook thenm wit te fir.

Sincerly, The Zombies

Zombies

 * Fire Zombie
 * Fire Flag Zombie
 * Fire Conehead Zombie
 * Fire Buckethead Zombie
 * Fire Bungee Zombie (Miniboss)
 * Fire Gargantuar (Boss)