"Block Buster!" (also sometimes listed as "Blockbuster!") is a 1973 single by Sweet. Written by Nicky Chinn and Mike Chapman, and produced by Phil Wainman, "Block Buster!" was the band's sole UK No. 1 hit. Released in January 1973, it spent five weeks at the top of the UK Singles Chart, and also made #1 in the Netherlands, Germany, New Zealand, Austria and Ireland, and #3 in Finland, Switzerland, Denmark and Norway. Outside Europe it fared less well as it peaked at #29 in Australia and at #73 on the American Billboard Hot 100.

Its riff was considered markedly similar to fellow RCA act David Bowie's "The Jean Genie", released shortly before, but all parties maintain that this was pure coincidence.

Some controversy rose after the band's performance of the song on the British television program Top of the Pops at December 25, 1973. In this performance, Sweet's bassist Steve Priest wore a Nazi uniform.

...
Wikipedia