Michael Fassbender is playing two different android characters in Prometheus, beginning as a maintenance worker for the real humans aboard the ship but developing his own dangerously human-like characteristics, such as jealousy and insecurity toward the crew.
Fassbender is back in Alien: Covenant, which also brought back Scott to direct his first proper "straightforward" android in Screen Rant's visit to the Covenant set.
Speaking in a new interview with EW, Fassbender explained that Walter, although technically an updated version of David, is supposed to have the former's human-like characteristics stripped away. Walter is less emotionally complex than the ego-wracked David and is more bound by logic - characteristics that Fassbender compared to a certain iconic Star Trek character:
"I wanted Walter to be more Spock-like — devoid of human characteristics or emotional contents that are programmed into David. I want him more like a blank canvas one can project things upon."
Walter recently appeared on an a prologue showing David's awakening.
Walter is being built up as a more robotic servant of the Covenant ship, while Neomorphs), but where he goes from there is anyone's guess. Fassbender's description of Walter as a "blank canvas" that others can "project" upon is nonetheless intriguing; it's likely that the two androids encounter each other at some point and it's possible that David attempts to corrupt or influence Walter in some fashion.
Fassbender isn't the only actor from Prometheus returning for Covenant. On top of a Noomi Rapace as Elizabeth Shaw, although whether she'll be alive or not by the time of the film's events is unclear.
Source: EW