The classic, featured in the newly-released movie "Thor: Ragnarok," achieves its best digital sales week.

Led Zeppelin's "Immigrant Song" returns to No. 1 on a Billboard chart thanks, once again, to Thor: Ragnarok.

After originally appearing in the film's trailer this spring (spurring a 7,000-download sales week on April 29-dated charts, according to Nielsen Music, good for No. 1 that frame on Hard Rock Digital Song Sales), the 1970 classic off Led Zeppelin III jumps back to No. 1 (from No. 14) on Hard Rock Digital Song Sales after being included in the Thor film itself, which opened in North American theaters Nov. 3.

"Immigrant" increases by a whopping 977 percent to 18,000 sold in the week ending Nov. 9, up from 2,000 in the previous week. That's the best tally for the song since it was first released digitally; it moved 14,000 its first week out as a download, nearly a decade prior (reflected on the chart dated Dec. 1, 2007).

Its latest sales sum is also good for No. 3 on Rock Digital Song Sales, the band's best rank on the chart, eclipsing the then-No. 9 peak of "Immigrant" earlier this year when the Thor trailer premiered. The track re-enters the all-genre Digital Song Sales chart at No. 27, marking the band's highest position and first appearance since Dec. 8, 2007.

Fueled by its sales surge and 133 percent boost to 2.1 million U.S. streams, "Immigrant" returns at a new No. 4 high on Hot Rock Songs, where older songs can re-enter if showing a meaningful increase and ranking in the top 25. The song previously hit No. 16 powered by the Thor trailer earlier this year.

That's not all. On the Billboard 200, Mothership, the Led Zeppelin greatest hits compilation released in 2007 concurrent with the band's digital debut, leaps 166-80 with a 70 percent gain to 8,000 equivalent album units. While track and streaming equivalent units make for a sizable chunk of that overall total, Mothership moved 2,000 in pure sales, a 71 percent increase. The set also bounds 11-2 on Hard Rock Albums.