Version
This article is for the PC version of Stellaris only.
Event chains
Anti-Alien Task Force is a pre-FTL civilization event chain that can trigger if an Observation Post is conducting 
Aggressive Observation. It can only happen once per game. Once the event chain starts dismantling the Observation Post or revealing the empire's presence will no longer be possible until the event chain ends one way or another.
Anti-Alien Task Force
In an apparent response to our operations on their primitive world, many of the [pre-FTL species name] nation states on [pre-FTL world name] have momentarily put aside their squabbling to form a new supranational military organization.
According to local media, this task force has been charged with defending their [planet or moon] from "hostile activities perpetrated by an unknown alien agency against the [pre-FTL species name] species as a whole."
Task Force Activities
Reconnaissance footage taken by our Observation Post above [pre-FTL world name] has confirmed the construction of several new military bases and radar facilities on the [planet or moon]'s surface, all under the control of the supranational anti-alien task force recently founded by the [pre-FTL species plural].
We are seeing an unprecedented level of cooperation between their nation states, and our abduction flights are now being routinely intercepted by atmospheric fighters belonging to this force. Despite our technological edge, their sheer numbers have enabled them to bring down several of our abduction shuttles!
Trigger conditions:
|
Mean time to happen:
|
 This will impair our aggressive observation activities. | |
Observation Post Lost
 Our Observation Post above [pre-FTL world name] has been destroyed! The culprit was a large surface-to-space missile launched from a military base controlled by the [pre-FTL species name] supranational task force.
|
Surgical Strike
 The staff of our Observation Post orbiting [pre-FTL world name] has requested help in dealing with the anti-alien task force that was founded by the [pre-FTL species plural] in response to our aggressive observation efforts. Though primitive by our standards, this organization has developed a knack for disrupting our abduction operations.
|
Task Force Disbanded
The supranational task force that the [pre-FTL species name] nation states founded to thwart our operations on [pre-FTL world name] has been disbanded! Though they somehow managed to achieve several victories against our shuttles and abduction teams, several of the organization's founding members decided to cut off funding and withdraw from the project.
| ||||||||||||
Successful Strike
 Our mission to destroy the main base of the [pre-FTL species name] supranational task force was a complete success! The base was infiltrated by our strike team, and its defenders and their primitive weapons proved no match for our skilled operatives.
|
Failed Strike
 Our mission to destroy the main base of the [pre-FTL species name] supranational task force failed miserably! Several of the shuttles carrying our strike team were brought down by hidden anti-aircraft emplacements before they even made it to the base. The remaining operatives met with unexpectedly stiff resistance when they eventually reached the base entrance.
| ||||||||