《七龍珠Z 劇場版：世上最強之人》（ドラゴンボールZ この世で一番強いヤツ，Dragon Ball Z: The World’s Strongest）於1990年由東映推出，是七龍珠Z系列第二部劇場版動畫。焦點放在科學與力量的對抗，藉由反派「威洛博士」的復活，帶來截然不同於主線劇情的科幻風格。

故事一開始，烏龍趁布瑪與龜仙人不注意時，偷偷拿走龍珠探測器，與悟飯一同前往寒冷的茲魯麥普雪山尋找聚集的龍珠。然而，他們並不知道，邪惡的克勤博士早已捷足先登，並利用神龍的力量實現願望——讓沉睡於冰原之下的天才科學家「威洛博士」復活。隨著許願完成，冰原中震動不止，一座龐大而詭異的建築物浮現，並有一批兇猛怪異的生物襲擊悟飯與同伴。就在危急之際，比克大魔王出手相救，但在戰鬥後卻神秘失蹤。

隨後，威洛博士的爪牙將目標轉向龜仙屋，企圖奪取龜仙人的身體。原來威洛博士在五十年前以天才科學家的身份廣受矚目，但卻因時代而未被重視，心中積壓著強烈的不甘。如今重獲新生的他，只剩下大腦存活於機械之中，為完成他向人類復仇與征服的野心，他需要奪取「世上最強之人」的肉體，才能重建自己的力量。威洛博士認為龜仙人乃是最強的戰士，因此鎖定他作為目標，但隨著悟空等人登場，戰局開始逆轉。最終，悟空憑藉龜派氣功與自身的力量，與夥伴並肩擊敗威洛博士，阻止這場災難。

在市場評價方面，作品以科幻色彩濃厚的劇情脫穎而出，將「超級科學」與「戰士力量」作為主軸，與系列中常見的武術大會或外星威脅有所不同。影片中的威洛博士被設定為「僅存大腦的科學怪物」，這種設計帶來一種恐怖感，也讓劇情更偏向經典科幻反派的模式。雖然整體故事架構較為簡單，主要仍是善惡對抗的傳統，但因為角色之間的互動與戰鬥張力，讓其在粉絲中留下深刻印象。

部分觀眾認為相比首部劇場版更加緊湊，尤其是比克一度被敵方控制、悟空與悟飯並肩作戰的橋段，增添戲劇性與親情元素。然而，也有人指出威洛博士的反派形象雖具新鮮感，但缺乏足以和布羅利等後期劇場版反派相提並論的壓倒性威脅。整體而言，《世上最強之人》是系列早期的一次重要嘗試，展現七龍珠在劇場版舞台上結合科幻與格鬥的可能性，為後續作品的題材多樣化鋪下基礎，同時在懷舊粉絲心中保有獨特地位。

Dragon Ball Z: The World’s Strongest (ドラゴンボールZ この世で一番強いヤツ, Dragon Ball Z: The World’s Strongest) was released by Toei in 1990 as the second feature film in the Dragon Ball Z movie series. Unlike the main storyline, this installment places its focus on the clash between science and raw power, introducing a distinctive sci-fi flavor through the revival of the antagonist, Dr. Wheelo.

The story begins when Oolong, taking advantage of Bulma and Master Roshi’s distraction, secretly steals the Dragon Radar and sets out with Gohan to the icy Tsurumai Tsuburi Mountains in search of the gathered Dragon Balls. Unbeknownst to them, the evil Dr. Kochin has already arrived and used Shenron to fulfill his wish—to revive the brilliant scientist Dr. Wheelo, who had been frozen beneath the glacier for decades. With the wish granted, the ice trembles violently, and an enormous, sinister fortress emerges. Strange and ferocious bio-warriors attack Gohan and his companions, but Piccolo intervenes to save the boy, only to mysteriously vanish after the battle.

Soon after, Dr. Wheelo’s minions set their sights on Kame House, attempting to seize Master Roshi’s body. It is revealed that fifty years earlier, Dr. Wheelo was celebrated as a genius scientist, but his talents were overlooked and wasted by society, leaving him with a deep grudge. Now, having been revived, his brain alone survives inside a massive machine. To fulfill his ambition of revenge and world domination, he seeks to obtain the body of “the world’s strongest fighter.” Believing Master Roshi to be that warrior, he targets him as his host. However, once Goku and his allies enter the battle, the tide begins to turn. Ultimately, Goku, with his Kamehameha and the combined efforts of his comrades, defeats Dr. Wheelo and prevents disaster.

In terms of reception, The World’s Strongest stood out for its heavy use of sci-fi elements, revolving around “super science” versus “warrior strength,” rather than the more familiar martial arts tournaments or alien invaders of the series. Dr. Wheelo’s design—as a “disembodied brain in a machine”—brought a sense of horror and leaned toward the archetype of classic science-fiction villains. While the overall plot followed the traditional good-versus-evil framework, the strong character interactions and intense battles left a lasting impression on fans.

Some viewers felt this installment was tighter and more engaging than the first Dragon Ball Z movie, especially with moments such as Piccolo temporarily falling under enemy control and Goku fighting alongside Gohan, which added both drama and family dynamics. On the other hand, some critics pointed out that while Dr. Wheelo was an interesting concept, he lacked the overwhelming menace of later iconic villains like Broly. Overall, The World’s Strongest marked an important early attempt to expand the Dragon Ball franchise’s themes on the big screen, blending sci-fi with martial arts action. It paved the way for greater thematic variety in later films, while still holding a nostalgic and unique place in the hearts of longtime fans.