This mission is available as soon as you arrive in Sanctuary in "The Road to Sanctuary", though it can not be completed until you gain access to the Crimson Raiders HQ in "Plan B", and serves as an introduction to Dr. Zed.
|Normal||True Vault Hunter|
Talk to Dr. Zed (who will be one of the exclamation marks on the map). He will ask you to help him with a surgery. Walk up to the man on the table and hit him with a melee attack to conduct the surgery. You will get a piece of Eridium from doing this. Take this to Patricia Tannis in the Sanctuary HQ. This will complete the mission.