由 Bandai 旗下品牌 Angel 於 1990 年 4 月 7 日在任天堂 Famicom（紅白機）上推出的《怪獸超人俱樂部 2：歸來吧怪獸超人俱樂部》（Ultraman Club 2: Kaettekita Ultraman Club），被視為系列邁向正統角色扮演遊戲的重要轉捩點。副標題「歸來吧」不僅向經典特攝作品《歸來的超人力霸王》致敬，也象徵本系列從前作的動作玩法，全面進化為具有完整劇情與成長系統的 RPG 體驗。

在技術與呈現上，奠定後續系列的核心框架。首次在大地圖探索中採用 SD 二頭身角色設計，使整體風格更為親切且辨識度高。戰鬥畫面則轉為類似《勇者鬥惡龍》的第一人稱視角，怪獸以巨大且細膩的點陣圖呈現，成功還原特攝劇中那種壓迫感十足的對峙氛圍。音樂方面也從單純的背景音效，轉變為更具冒險感與節奏張力的旋律，在戰鬥時尤其能營造緊張氣氛。操作介面則採用簡潔直觀的指令選單，即使是年輕玩家也能輕鬆上手。

故事從光之國遭受怪獸軍團突襲展開，多位奧特戰士在混亂中失蹤。玩家扮演初代超人力霸王，奉奧特之父之命展開救援行動，前往地球與宇宙各地尋找失散的同伴。隨著劇情推進，賽文、傑克、艾斯等經典角色會陸續加入隊伍，讓整體冒險逐漸壯大。整個故事圍繞著尋人、集結與對抗幕後邪惡勢力展開，最終目標是恢復宇宙的和平，並展現兄弟齊心的英雄精神。

在玩法上，採用第一人稱回合制戰鬥系統，在攻擊、防禦、使用必殺技或道具等指令中做出選擇。遊戲的一大特色是各角色專屬的光線必殺技，例如初代的斯派修姆光線、賽文的艾梅利姆光線與頭標攻擊、以及傑克的奧特火花等。這些技能威力強大，但會消耗能量，因此在戰鬥中如何分配資源成為關鍵策略。此外，賽文加入後還能使用膠囊怪獸系統，召喚輔助單位協助作戰，為戰鬥增加更多變化與戰術深度。玩家也需要透過不斷戰鬥提升等級，並在廣大的地圖中探索村莊與據點，取得裝備與關鍵道具，以推進劇情發展。

在市場評價方面，被認為是一次相當成功的轉型。評論普遍指出，將奧特曼這類強調動作與戰鬥的英雄題材融入 RPG 架構，是一個極具創意且效果良好的嘗試，讓玩家能夠親身體驗角色逐步成長與夥伴集結的過程。雖然遊戲仍帶有早期 RPG 常見的練功需求，但豐富的怪獸種類與探索內容，讓整體過程不至於單調。從歷史角度來看，《怪獸超人俱樂部 2》不僅是系列成熟的重要基礎，也為後續評價更高的續作鋪平道路，確立了奧特曼題材在 RPG 領域中的發展方向。

Released by Bandai’s Angel label on April 7, 1990, for the Nintendo Famicom, Ultraman Club 2: Kaettekita Ultraman Club is widely regarded as the turning point where the series successfully transitioned into a full-fledged role-playing game. The subtitle “Kaettekita” (“Return”) not only pays homage to Return of Ultraman but also symbolizes the franchise’s evolution from a simple action title into a story-driven RPG with deeper mechanics and progression.

From a technical and presentation standpoint, the game established the foundation for later entries in the series. It was the first to feature super-deformed (SD) character sprites on the world map, giving the game a more approachable and visually distinctive style. Battles adopted a first-person perspective similar to Dragon Quest, with large, highly detailed monster sprites that effectively captured the imposing presence of kaiju from the original tokusatsu series. The music also shifted toward more adventurous and dynamic compositions, especially during battles, where it heightened tension. Meanwhile, the user interface was designed with simplicity in mind, making the command-based system intuitive even for younger players.

The story begins with the Land of Light under attack by a mysterious monster army, leaving several Ultraman warriors missing. Players take control of the original Ultraman, who is tasked by the Father of Ultra to embark on a rescue mission across Earth and various parts of the universe. As the narrative progresses, iconic characters such as Ultraseven, Jack, and Ace gradually join the party, expanding both the scope of the adventure and the player’s strategic options. The plot revolves around themes of rescue, reunion, and ultimately confronting a powerful hidden evil to restore peace to the cosmos.

Gameplay is centered on a first-person, turn-based battle system where players choose commands such as attack, defend, use special moves, or items. One of the defining features is each character’s signature beam attacks, including Ultraman’s Spacium Beam, Ultraseven’s Emerium Beam and Eye Slugger, and Jack’s Ultra Spark. These abilities are powerful but consume energy, making resource management a crucial part of combat strategy. Additionally, once Ultraseven joins the team, players gain access to the Capsule Kaiju system, allowing them to summon support monsters to assist in battle, adding another layer of tactical depth. Progression follows traditional RPG mechanics, with players leveling up through combat while exploring a large world map filled with towns, bases, and hidden items necessary for advancement.

Critically, the game was praised as a surprisingly successful genre shift. Reviewers noted that adapting the Ultraman franchise—traditionally focused on action—into an RPG format was both innovative and effective, allowing players to experience the gradual gathering of heroes in a meaningful way. While it retains some of the grinding typical of early RPGs, the variety of enemies and exploration elements help maintain engagement. Historically, Ultraman Club 2 is considered the essential foundation for the series’ later peak, paving the way for more refined sequels and proving that the Ultraman universe could thrive beyond action gameplay into deeper, narrative-driven adventures.