diff --git a/solutions/python/ellens-alien-game/3/classes.py b/solutions/python/ellens-alien-game/3/classes.py
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+++ b/solutions/python/ellens-alien-game/3/classes.py
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+"""Solution to Ellen's Alien Game exercise."""
+
+
+class Alien:
+    """
+    Alien located at given coordinates.
+
+    Attributes
+    ----------
+    (class)
+    total_aliens_created: int
+    x_coordinate: int - Position on the x-axis.
+    y_coordinate: int - Position on the y-axis.
+    health: int - Number of health points.
+
+    Methods
+    -------
+    hit(): Decrement Alien health by one point.
+    is_alive(): Return a boolean for if Alien is alive (if health is > 0).
+    teleport(new_x_coordinate, new_y_coordinate): Move Alien object
+                                                  to new coordinates.
+    collision_detection(other): Implementation TBD.
+    """
+
+    total_aliens_created: int = 0
+
+    def __init__(self, x_coordinate: int, y_coordinate: int):
+        """
+        Initialize a new Alien at the provided coordinates.
+
+        Sets health to 3, assigns x and y coordinates, and increments
+        Alien.total_aliens_created.
+
+        :param x_coordinate: Position on the x-axis.
+        :param y_coordinate: Position on the y-axis.
+        :return: None
+        """
+        self.health: int = 3
+        self.x_coordinate = x_coordinate
+        self.y_coordinate = y_coordinate
+        Alien.total_aliens_created += 1
+
+    def is_alive(self):
+        """
+        Return whether the alien is alive.
+
+        :return: True if health > 0, else False.
+        """
+        return self.health > 0
+
+    def hit(self):
+        """
+        Decrement the alien's health by one point.
+
+        :return: None
+        """
+        self.health -= 1
+
+    def teleport(self, new_x_coordinate, new_y_coordinate):
+        """
+        Decrement the alien's health by one point.
+
+        :return: None
+        """
+        self.x_coordinate = new_x_coordinate
+        self.y_coordinate = new_y_coordinate
+
+    def collision_detection(self, other):
+        """
+        Determine whether this Alien collides with another.
+
+        Implementation TBD; currently returns None.
+
+        :param other: Another Alien or object to check for
+                      positional overlap.
+        :return: None
+
+        `Source: /ellens-alien-game/classes_test.py`
+        """
+        pass  # pylint: disable=unnecessary-pass
+
+
+def new_aliens_collection(
+    alien_start_positions: list[tuple[int, int]],
+) -> list:
+    """
+    Create a list of Alien objects from starting positions.
+
+    :param alien_start_positions: given a list of positions
+    :return: a list of Alien() objects
+    """
+    return list(Alien(pos[0], pos[1]) for pos in alien_start_positions)