Thor #391 May 1988
"The Madness of Mongoose" Guest starring The Amazing Spider-Man!
In New York, Thor
as Sigurd Jarlson looks up his old boss Jerry to see about work;
On site, he is attacked by the Mongoose, who is sent by an unknown master;
With Spider-Man's help, Thor drives him off, but before escaping, the Mongoose knocks out the support pillars;
Thor manages to support the entire building while Spider-Man braces it so it wont collapse.
Script by Tom DeFalco,
pencils by Ron Frenz,
inks by Brett Breeding