After Megatron blasted the Space Bridge, he ended up in Londons' sewers. Blades find him and Grimlock and Centurion show up to see if the life reading is the missing Goldbug and Blaster (which it isn't, it's Megatron). Grimlock and Megatron battle as Action Force (AKA GI Joe) feebly trips to stop Megatron as well. Centurion takes Grimlocks' places just before Action Forces' Skystrikers blow up some flammable gas containers. Megatron and Centurion are presumed dead, but actually they end up in the River Thames where they rust in place.
Crossover con "Action Force" #24-27