• "Thor: Ragnarok" star Chris Hemsworth shows his bulge in "Vacation."

"Thor: Ragnarok" star Chris Hemsworth shows his bulge in "Vacation." (Photo : YouTube/Comedy Central)

The "Vacation" release date is almost a week away and "Thor: Ragnarok" star Chris Hemsworth's bulge, as seen in one the film remake's trailers, has been explained, thanks to Ed Helms.

In a recent interview with Access Hollywood, Helms said, "That scene with the underwear sight gag, I think people look at that and kind of quickly assume, 'Oh it's funny because of the underwear sight gag,' but it's not."

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"That's not why it's funny; it's funny because of Chris' performance," explained Helms, who plays Rusty Griswold in the adventure comedy directed by John Francis Daley and Jonathan M. Goldstein.

When it comes to deciding on how far to go with Hemsworth's bulge, Helms said the "Vacation" film's creative team had a lot of discussions about "what is funny" and "when does it go from funny to horrifying."

Helms pointed out that he was not part of those discussions but he happened to think that the "Vacation" film's creative team nailed it. He said that he could barely make it through filming the "Vacation" underwear scene with Hemsworth's bulge, which he said is "exactly what it should be" whatever it is.

"I hope we see him do a lot more comedy," Helms said of Hemsworth, who is also set to do another reboot, the all-female "Ghostbusters," in 2016. In 2017, Hemsworth will star in "Thor: Ragnarok," which will also star "Blind Spot" star Jamie Alexander, MTV reported.  

Along with Helms and Hemsworth, "Vacation" also stars Leslie Mann, Elizabeth Gillies, Michael Pena, Christina Applegate, Chevy Chase and Beverly D'Angelo, among others. The film is set to premiere on July 29.

See Hemsworth's bulge in a "Vacation" trailer here: