Pro Sound Effects, Thunder with Lion Roar, Searing Blast, Lightning Strike and Crack, Growl, Low Rumble, Roar, Grumble, Tearing Atmosphere, Electric Burst, Zaps at Tail, Several Versions

This sound effect can be found on The Odyssey Collection: Expanded Sound Effects Library, which was made by Pro Sound Effects. Some takes include the infamous 1982 MGM Roar.

Audio Samples