To unlock Walter, reach level 6 of Breakdown.
- The first name Walter is likely a reference to the character Walter White in the TV show "Breaking Bad". The surname Degrasse might be a reference to Neil deGrasse Tyson, one of America's best-known scientists.
- The character also bears some similarity to Gordon Freeman, the main protagonist of Half-Life series. Both wear a protective orange-black suit and carry a crowbar as melee weapon.
- The character bears a strong resemblance, in both appearance and role, to Hypatia Noether, also designated "The Scientist", in the video game Fort Zombie.
- When Walter Degrasse is following you on a mission, he will be vulnerable to screamers although he has a hazmat suit
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