Question: What fictional Marvel Comics superhero team uses the Leapfrog as their main transportation?
Sentence (from "The Avengers (2012 film)"): The film was written and directed by Joss Whedon and features an ensemble cast that includes Robert Downey Jr., Chris Evans, Mark Ruffalo, Chris Hemsworth, Scarlett Johansson, Jeremy Renner, Tom Hiddleston, Clark Gregg, Cobie Smulders, Stellan Skarsgård, and Samuel L. Jackson.
Relevant evidence: No