"Godzilla vs. Megalon (ゴジラ対メガロ)", Original Japanese Movie Poster 1973, Toho Release, Very Rare, B1 Size (c.73 × 103 cm)

“GODZILLA VS. MEGALON” (1973) – ORIGINAL JAPANESE B1 THEATRICAL POSTER – TOHO CHAMPION FESTIVAL / SPEECH‑BUBBLE CAMPAIGN 
Extremely Rare | Large Format | First Japanese Release (1973) | 72.8 × 103 cm (B1)

This is an original Japanese B1 poster printed by Toho for the spring 1973 theatrical release of Godzilla vs. Megalon（ゴジラ対メガロ）—directed by Jun Fukuda with special effects by Teruyoshi Nakano and music by Riichiro Manabe. It’s the 13th film in Toho’s Godzilla series and the picture that introduced Jet Jaguar, joining Godzilla to battle Megalon (Seatopia’s beetle‑god) and returning villain Gigan. Japan opened the film March 17, 1973, within Toho’s kid‑focused Toho Champion Festival program. 

Japan‑only Champion Festival style
The round 東宝チャンピオンまつり logo at lower left places this in Toho’s holiday festival series (1969–78), a uniquely Japanese exhibition format pairing Godzilla with TV anime and other kid attractions during school breaks. Posters for these runs often used playful design to grab children’s attention—like the comic speech bubbles seen here. 

Poster design (what you see here)
A bright, open‑sky photograph lines up four kaiju from foreground to back—Jet Jaguar, Godzilla, Gigan, Megalon—each “speaking” to the audience in friendly bubbles. The title ゴジラ対メガロ explodes in candy‑red with green drop‑shadow; an Eirin censorship seal is printed at top right—both hallmarks of first‑issue theatrical material. Note a wonderful quirk: Jet Jaguar introduces himself by his prototype name “Red Alone” (レッドアローン), reflecting the character’s path from a public design contest winning entry (“Red Alone”) to the finished hero renamed Jet Jaguar; early promotions sometimes still used the old name. Gigan’s bubble boasts of his infamous abdominal buzz‑saw. 

What the monsters are saying (bubble translations)

• Jet Jaguar（レッドアローン）: 「ボクはレッドアローン。ゴジラと力を合わせて地球の平和を守ります。」
  “I’m Red Alone. Together with Godzilla I’ll protect the peace of the Earth.”

• Godzilla（ゴジラ）: 「みなさん元気ですか。すごい悪者怪獣がでてきたのでボクも苦戦です。だけどがんばるよ。」
  “Hope everyone’s well—some terrible villain monsters have appeared, so even I’m struggling…but I’ll keep fighting!”

• Gigan（ガイガン）: 「ガイガン様だ！ お腹の歯車でゴジラなんかまっ二つ。こんどこそ負けないぞ！」
  “It’s Lord Gigan! With the gear in my belly I’ll split Godzilla in two—this time I won’t lose!” (refers to Gigan’s stomach buzz‑saw). 

• Megalon（メガロ）: 「オレはメガロだ！ 悪いことならまかしとけ！ かたい甲らでゴジラの放射能なんかへっちゃらだ。」
  “I’m Megalon! Leave the evil deeds to me! With my hard shell, Godzilla’s radiation breath is nothing.”

About the B1 format (size & rarity)
Japanese theatrical posters were issued in B‑series sizes; B1 = 728 × 1030 mm (c. 28 × 40.5 in), roughly twice the area of the standard B2. B1s were printed in smaller quantities for prominent theater displays, so survival rates are far lower—especially for children’s festival runs that saw hard use. 

The film’s significance
Though modest in budget, Godzilla vs. Megalon became one of the series’ most widely seen entries in the West thanks to its 1976 U.S. theatrical run, a 1977 NBC prime‑time broadcast with John Belushi bumpers, countless VHS/TV airings, and a 1991 MST3K episode—fame that helped cement the movie’s “camp‑classic” reputation. Jet Jaguar’s origin from a public design contest—the winning character “Red Alone”—is a beloved bit of series lore. 

Why this example is extraordinary (rarity & market)
Large‑format Champion Festival B1s like this one—especially with the early Red Alone naming captured in‑print—almost never surface. These were theater tools, not retail goods, and were commonly discarded after use; finding a bright, clean survivor is exceptional. 

Condition
Very Good / Excellent, folded (original tri‑folds and cross‑fold as issued): rich color, strong paper; tiny cross‑fold stress and a split at the central junction; clean margins; Eirin seal present (see photos). A scarce, display‑scale piece of Showa‑era Godzilla history.

It is 52 years old.
It is not a reproduction or a reprint.
Certificate of Authenticity included.