Paltrow, who played the Marvel Comics character in Iron Man and Iron Man 2, is glimpsed briefly in the new Japanese trailer for Joss Whedon's superhero ensemble.
Last May, Paltrow suggested that she would play Pepper again in Iron Man 3 and potentially have a small role in The Avengers.
The two-and-a-half-minute trailer also features new footage from the blockbuster, including the introduction of Cobie Smulders as SHIELD agent Maria Hill and a fresh look at Loki's alien army wreaking havoc in Los Angeles.
The Avengers sees Captain America (Chris Evans), Iron Man (Robert Downey Jr) and Thor (Chris Hemsworth) leading the comic book team's lineup, with Hulk (Mark Ruffalo), Hawkeye (Jeremy Renner) and Black Widow (Scarlett Johansson) joining the fight to save the planet.
The Avengers opens in UK cinemas on April 26 (under the title Marvel Avengers Assemble) and May 4 in the US.
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Watch the Avengers Japanese trailer below: