Impulse Experiment (衝動 エクスペリメント Shōdō Ekusuperimento?) is Mission 20 of Macross Δ. It first aired on Tokyo MX and BS11 in Japan on August 14, 2016.


Freyja is called along Hayate for an experiment to measure the effects of her singing into his body, but concerned about his well-being, she finds herself unable to sing. Meanwhile on Windermere, Keith is in doubt regarding Lloyd's true intentions and asks his squadmates, the twins Theo and Xao Jussila, for a favor. Worried that Freyja might leave Walküre for his sake, Hayate decides to resign from the Delta Squadron, but Freyja insists that she is the one who must step down, until Mirage lectures both to not relinquish their dreams and careers for each other. With Mikumo still on the medical bay and off limits to visitation, Kaname, Makina and Reina decide to infiltrate the place in order to find her, but they are caught midway and while Makina and Reina are arrested, Kaname discovers the place where Mikumo is being held.