In "Farewell to Space Battleship Yamato" (also rendered as Arrivederci Yamato), the Yamato and her crew face the onslaught of the Comet Empire, a civilization from the Andromeda Galaxy who seek to conquer Earth, led by Zohdah the Great. The Yamato is aided by a telekinetic woman composed of anti-matter, Teresa of Telezart, while the Comet Empire has restored to life Earth's old enemy, the Gamilas' leader Desslar, who is eager for revenge. After a massive battle which destroys both Earth and Comet Empire fleets, the Yamato crew defeat Zohdah's fortress, but at the cost of the ship and their lives. A massive fan outcry to the film convinced the show's creators to make a second season of the TV series based on the film, but with a much different ending. As such the events of Farewell to Space Battleship Yamato are now considered to be an alternate storyline altogether and is no longer regarded as official canon.
La Yamato ed il suo equipaggio devono affrontare l'assalto dell'Impero Comet, una civiltà proveniente dalla galassia Andromeda che sta tentando di conquistare la Terra, guidata da Zwordar il Grande. la flotta terrestre è invece aiutata da una donna fatta di antimateria, Teresa di Telezart, mentre l'impero Comet ha fatto rinascere il più grande nemico della razza umana, il leader dei Gamilas, Desslar, in cerca di vendetta. Dopo una sanguinosa battaglia che vede ingenti perdite sia sul fronte terrestre che sul fronte Comet, sarà l'estremo sacrificio di Susumu Kodai a sconfiggere definitivamente Zwordar ed a salvare la razza umana
2201年、コスモクリーナーＤによって、滅亡の危機を逃れた人類は、急速な勢いで文明を復興していた。だが、宇宙の彼方より、再び脅威が迫りつつあった。星ぼしを破壊しつつ、宇宙を進撃する謎の白色彗星が、刻一刻と太陽系に接近しつつあったのだ。一方、白色彗星の到来を警告する謎のメッセージを受信した古代、相原の元ヤマトクルーは、防衛軍上層部に彗星の危険を進言するが、聞き入られない。そこで、古代はかつてのヤマトクルーを召集、防衛軍の制止を振り切りメッセージの発進源を目指しヤマトを発進させる。だが既に、侵略者の魔の手は、太陽系第11番惑星にまで及んでいた……。
Nachdem Desler besiegt wurde, gehen alle Crew-Mitglieder der Yamato ihre eigenen Wege. Die Erde erholt sich endlich wieder. Till Shima und Sanado empfangen eine Übertragung von einer Frau namens Theresa. Diese berichtet über einen weißen Kometen, der alles zerstört, was sich ihm in den Weg stellt. Nach einer Meuterei startet die Yamato von der Erde, um sich dem Feind zu stellen gegen den selbst ihre Wave-Motion-Kanone machtlos ist.
