Unlockables
Unlockable Aliens
You can unlock aliens by satisfying the corresponding requirements indicated below.
- Swampfire - Finish Level 1: Stow Away
- Aerodactyle - Finish Level 2: Mess Hall Mashup
- Bullfrag - Finish Level 2: Mess Hall Mashup
- Big Chill - Finish Level 3: Welcome to Erf
- Gravattack - Finish Level 4: Underground and Beyond
- XLR8 - Finish Level 4: Underground and Beyond
- Cannonbolt - Finish Level 5: Core of the Problem
