Dave Grohl stepped in for Jimmy Kimmel on ABC's late night program on Halloween.
Actress Kristen Bell featured as a guest, with Alice Cooper teaming with the Foo Fighters for a musical performance.
Growl donned a white beard, glasses and letterman jacket to impersonate late night legend David Letterman.
Bell, dressed like Tom Selleck, serenaded the crowd with a rendition of “Do You Want to Build a Snowman?” from Frozen.
Grohl then jumped on the drums and turned the performance into a Metallica mash-up.