No, you don't have to defend Earth against radiants, roombas and teleporting ghost's, you just gotta have fun and mess with your abilities. What agent are you picking? Personally, I'll go with Jett or Skye.

I thought Riot said immortal (as it’s one rank now) will use the old immortal 3 badge. I’ve seen a couple of immortals now and they all have the old immortal 1 badge and not the immortal 3 badge. Is this a bug or what?