Yep, I remember Thor appearing in Invaders! And if memory serves, Thor knocked out Namor, proving he was stronger. Thor then used his lightning on Union Jack to revive him, giving UJ electrical blasting powers after he awoke.
Master Man, Warrior Woman and UMan were super strong villains.
Namor the Sub-Mariner, Marvel's oldest character, will have been published for 85 years in 2024. So where's my GOOD Namor anniversary ongoing, Marvel?