Trixie is a proud mother to a unicorn colt named Dusky Hex. Nopony knows who the father is, not even Trixie, but as a dedicated mother, she is willing to do anything for her son.

When Father's Day arrives, Dusky Hex asks his mother about WHO his father was. When Trixie finds a card written just for that stallion, she knows that she must deliver it. For her sone, she'd do anything.